SM6FBQ / HackRF clone - History

Forgot to include rf_path.h now that its pin setup is called from hackrf_core.

Merge remote-tracking branch 'mossmann/master' into jboone_refactor_20130906

Conflicts:
firmware/common/hackrf_core.h
firmware/common/rffc5071.c

Giant .gitignore to knock out build files, Xilinx spew, and editor/OS turds.

Remove I2S pin definitions, since they're too specific for generic/shared HackRF code.

Massive rework of Makefile_inc.mk, to support building of heterogeneous (M4+M0) binaries, and easy switching between RAM and SPIFI-bootable builds. Constructive criticism welcome -- I'm sure there's better ways to do this.

Fix broken sgpio-rx project, broken due to massive changes to how RF path and tuning is done.

Fix naming problem with SGPIO test project. This is due to my use of VPATH in Makefile_inc.mk, which I'm starting to regret a little bit...

Add sgpio.c to C files, now required for pin initialization.

With Makefile RAM/SPIFI option, remove/rework redundant "rom_to_ram" projects.