[API] move SQLite into its own module
To break unneeded dependencies in postprocessing the SQLite part is moved to its own module and namespace. Therefore in the include and the function calls "postprocessing" hast to be removed or replaced by "sqlite" e.g.: #include "postprocessing/sqlite/SQLite.h" -> #include "sqlite/SQLite.h" postprocessing::store... -> sqlite::store...
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