Draft: C Interfacing

This MR enables C compatibility for the generated target code

• Adds SfgConfig.c_interfacing option that automatically marks all function declarations as extern "C"
• Provides hybrid compilation mode for header files where C/C++ includes and also function definitions are guarded by

#ifdef __cplusplus 
<cpp includes...>

#define EXTERNC extern "C"
#else 
<hybrid includes...>

#define EXTERN C
#endif

• Automatically converts C++ header includes, e.g. <cstdint>, to C compatible header includes, e.g. <stdint.h>, for hybrid mode

added 2 commits

• 41d1276c - Fix lint
• 34012b36 - Fix typcheck

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added 1 commit

• 0c03bf06 - Fix tests

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added 1 commit

• b5645502 - Fix emission of hybrid header includes

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marked this merge request as draft

added 1 commit

• 3912add0 - Revert unnecessary change

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added 8 commits

• 3912add0...a481ccf2 - 6 commits from branch master
• 9326e4b5 - Merge branch 'master' into rangersbach/c-interfacing
• 5b1588df - Fix formatting in __cplusplus guards

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