- Replace `SfgSymbolLike` by `SfgKernelParam`
 - Update postprocessing to work with parameter properties
 - Add tests

Squashed commit of the following:

commit d017185f
Author: Frederik Hennig <frederik.hennig@fau.de>
Date:   Wed Oct 23 10:13:06 2024 +0200

    adapt to KernelParameter API changes

commit b2857481
Author: Frederik Hennig <frederik.hennig@fau.de>
Date:   Tue Oct 22 15:14:01 2024 +0200

    don't ignore the type

commit 6d02cb47
Author: Frederik Hennig <frederik.hennig@fau.de>
Date:   Tue Oct 22 15:12:49 2024 +0200

    Adapt field parameter collection to changes in pystencils.

Composer and language Frontend:

    - Minimialize exposition of `SfgVar`, use `AugExpr` in all composer
    interfaces instead
    - Move `SfgVar` into `lang` module
    - Introduce `VarLike` and `ExprLike` protocols to the `lang` module
    - Treat `TypedSymbol` equivalently to SfgVar in interfaces
    - Disallow `sp.Symbol` in expressions
    - Deprecate `map_param` in favor of newly introduced `set_param`,
    which uses `AugExpr`
    - Deprecate `sfg.define` in favor of `sfg.code`
    - Introduce `Ref` type

IR Postprocessing:

    - Check for type conflicts during live-variable collection

Documentation:

    - Add docstrings to `lang.expressions` module
    - Add various doctest examples to docstrings
    - Link to pystencils via intersphinx

Tests:

    - Fix bugs in generator script testing
    - Add new testscripts
    - Add unit tests for parts of `lang.expressions` and
    `ir.postprocessing`

Squashed commit of the following:

commit c75b939d
Author: Frederik Hennig <frederik.hennig@fau.de>
Date:   Fri Oct 18 13:17:52 2024 +0200

    fix badges in readme and doc homepage

commit 425efea7
Author: Frederik Hennig <frederik.hennig@fau.de>
Date:   Fri Oct 18 13:00:35 2024 +0200

    Update CONTRIBUTING & test documentation

commit 3d41d1de
Author: Frederik Hennig <frederik.hennig@fau.de>
Date:   Fri Oct 18 11:51:47 2024 +0200

    add coverage badge to readme.

commit 3023541e
Author: Frederik Hennig <frederik.hennig@fau.de>
Date:   Fri Oct 18 11:45:54 2024 +0200

    Update .gitlab-ci.yml file

commit fdfaf307
Author: Frederik Hennig <frederik.hennig@fau.de>
Date:   Fri Oct 18 11:40:14 2024 +0200

    Update .gitlab-ci.yml file

commit ac133b75
Author: Frederik Hennig <frederik.hennig@fau.de>
Date:   Fri Oct 18 11:38:54 2024 +0200

    add `coverage` key to CI task

commit 72ed2ab8
Author: Frederik Hennig <frederik.hennig@fau.de>
Date:   Fri Oct 18 11:28:43 2024 +0200

    keep coverage.xml artifact

commit 31c65ed8
Author: Frederik Hennig <frederik.hennig@fau.de>
Date:   Fri Oct 18 11:23:42 2024 +0200

    change testsuite in CI to run coverage.py directly

commit f6893443
Author: Frederik Hennig <frederik.hennig@fau.de>
Date:   Fri Oct 18 11:10:34 2024 +0200

    try to fix coverage, pt. 2

commit a7fc061b
Author: Frederik Hennig <frederik.hennig@fau.de>
Date:   Fri Oct 18 11:05:17 2024 +0200

    try to fix coverage

commit 3cb194c5
Author: Frederik Hennig <frederik.hennig@fau.de>
Date:   Fri Oct 18 11:01:11 2024 +0200

    Deprecate map_param. Fix test suite

commit f0d11ee2
Author: Frederik Hennig <frederik.hennig@fau.de>
Date:   Fri Oct 18 10:52:39 2024 +0200

    Disable non-const SymPy expressions in AugExpr formatting. Add tests.

commit b2ebfb02
Author: Frederik Hennig <frederik.hennig@fau.de>
Date:   Fri Oct 18 09:42:20 2024 +0200

    deprecate `define` in favor of `code`

commit d97191f5
Author: Frederik Hennig <frederik.hennig@fau.de>
Date:   Fri Oct 18 09:31:08 2024 +0200

    fix mypy; reformat all

commit 3182652c
Author: Frederik Hennig <frederik.hennig@fau.de>
Date:   Fri Oct 18 09:29:38 2024 +0200

    Update documentation

     - use pystencils 2.0 intersphinx
     - add doc for composer builders, SfgException, config subobjects

commit fbd9d9b4
Author: Frederik Hennig <frederik.hennig@fau.de>
Date:   Fri Oct 18 09:29:03 2024 +0200

    changes to lang and ir modules

    - Move `SfgVar` to `lang`
    - Remove builder for `init`, use nested function instead
    - Add various docstrings

commit 6a5c6936
Author: Frederik Hennig <frederik.hennig@fau.de>
Date:   Fri Oct 18 08:50:53 2024 +0200

    move VarLike, ExprLike, asvar, depends to lang module and add docstrings.

commit fce5897c
Author: Frederik Hennig <frederik.hennig@fau.de>
Date:   Thu Oct 17 17:38:16 2024 +0200

    remove duplicate standard import from test script

commit 5c595075
Author: Frederik Hennig <frederik.hennig@fau.de>
Date:   Thu Oct 17 17:29:47 2024 +0200

    More frontend updates

     - Add `Ref` type
     - Allow multi-arg `init` in constructor builder
     - Change `CustomGenerator` to take a composer instead of a context.
     - Allow a class to have multiple methods with the same name.

commit 7a4ff746
Author: Frederik Hennig <frederik.hennig@fau.de>
Date:   Thu Oct 17 16:00:51 2024 +0200

    Add CustomGenerator to docs. Fix bug in postprocessing.

commit 2edd363e
Author: Frederik Hennig <frederik.hennig@fau.de>
Date:   Thu Oct 17 15:47:13 2024 +0200

    More examples for composer. Fix generator script tests ground-truth comparison.

commit a662f194
Author: Frederik Hennig <frederik.hennig@fau.de>
Date:   Thu Oct 17 14:56:58 2024 +0200

    add doctests to testsuite

commit ab113916
Author: Frederik Hennig <frederik.hennig@fau.de>
Date:   Thu Oct 17 14:56:27 2024 +0200

    Extend doctests

commit 8f04e828
Author: Frederik Hennig <frederik.hennig@fau.de>
Date:   Thu Oct 17 13:56:37 2024 +0200

    move generator script tests

commit af32c802
Author: Frederik Hennig <frederik.hennig@fau.de>
Date:   Thu Oct 17 13:56:23 2024 +0200

    Extend conflict resolution in postprocessing + add tests

commit 7ff8e893
Author: Frederik Hennig <frederik.hennig@fau.de>
Date:   Thu Oct 17 12:27:24 2024 +0200

    fix testsuite CI task

commit 3534ed16
Author: Frederik Hennig <frederik.hennig@fau.de>
Date:   Thu Oct 17 10:22:15 2024 +0200

    Toward cleaning up variables and expressions in the composer

commit 91889646
Author: Frederik Hennig <frederik.hennig@fau.de>
Date:   Wed Oct 16 22:44:22 2024 +0200

    bugfixes + more AugExpr in interfaces