Refactor to use source & headers structure

[jakubberkop]

Work in progress for #2171.
Is this the refactor you have in mind? @robbederks

Building of jungle and body binaries are commented out of now, just to get a poc of the refactor.

[robbederks]

Haven't reviewed in depth, but I think this is roughly in the same direction I'd start. Obviously still needs a lot of work to get the subprojects building and all tests passing again, after that I can give it a closer look.

[jakubberkop]

Ready for a review. @robbederks

• I have have suppressed few things in the tests/misra/test_misra.sh, most notably the opendbc includes, as they were causing issues and modifying them seemed out of scope for this task.
• I also suppressed unused function warnings, for functions that were only used in board/bootstub.c, which is also excluded from the analysis.

[jakubberkop]

@robbederks please take a look when you have a chance.

[robbederks]

trigger-jenkins

[robbederks]

@jakubberkop: looks like it builds and flashes, but doesn't boot on the panda jungle and thus doesn't try it on the pandas either. do you have any hardware to test this on? does it boot on pandas? If not I can try to debug it too

[jakubberkop]

@robbederks: Unfortunately no, I don't have any hardware.
I went once again through all of my changes related to panda jungle, and couldn't find anything, so help in debugging it would be greatly appreciated.