Device generator i2c (#37)

* fixed indeterministic shuffle of contexts in MX_Device.h

* Added MX_Device.h path to add-path:

* fixed error in mxDevice_test.go

* Fixed old test

* Forgot to remove comment chars of t.Parallel

* switched secure and non secure mode
added tests
added download info from global.generator.yml

* Fixed formatting and lint complaints

* corrected wrong test for not set environment variable

* Removed fPaths again, they are not necessary, can used project directly
Added more tests

* removed a ;

* Added I2C filter extraction
more Tests

* changed formatting

* tried to fix a lint problem

* fixed publish coverage step

* fixed publish coverage step

* added output of command line
commented out reading of packs fro cbuild-gen.yml

* Added support for GCC, CLAN and IAR compiler. Added startup, system and linker files (generated by CubeMX) to cgen.yml. (#32)

* Revert "Added support for GCC, CLAN and IAR compiler. Added startup, system a…" (#36)

This reverts commit 16a10cb.

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Co-authored-by: Bernd-Gunter Nitzler <Bernd-Gunter.Nitzler@arm.com>
Co-authored-by: bgn42 <92579424+bgn42@users.noreply.github.com>
Co-authored-by: Sourabh Mehta <sourabh.mehta@arm.com>
Co-authored-by: David Lesnjak <david.lesnjak@arm.com>