Make HyTeG aware of system's byte order

Merge adds a new macro HYTEG_ARCH_ENDIANESS to HytegDefinitions that is set by CMake to the value of CMAKE_CXX_BYTE_ORDER. We also add a query method systemEndianess() to BuildInfo. We use this information then to place the correct information into our VTU output files, instead of hardcoding LittleEndian everywhere.

In order to use the CMake macro we need 3.20 as minimal version and document this in our README.

added Build Process Refactoring labels

requested review from @thoennes

assigned to @mohr

changed the description

When this get's merged it closes #217 (closed)

added 1 commit

• 86aa425c - Also update minimal CMake version in CMakeLists.txt

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merged

mentioned in commit be0f8b76