Automated updates of the C++ code generated by the multi_tables script, now it is placed into the mixer_multirotor.generated.h file which is generated by makefile

Standard and embedded types work, may need small refinements for some
types

Initial UAVCAN integration. The library compiles successfully, CAN driver appears to be working properly. There is one hardcoded path in the module makefile that needs to be fixed; plus the compilation will likely fail unless arch/math.h contains log2l()

Also, generally clean-up the .gitignores and farm off separate versions for the NuttX/Apps directories to keep things tidy.

Un-ignore the *.d directories in the ROMFS directory to avoid ignoring the init.d directory and friends. This is rinky, but the alternatives are all a mess.

Automatically generate depdencies for source files as they are compiled, rather than using the NuttX dependency generator tool.