This commit updates the visibility of various header files and cleans up
some unnecessary inclusions. Also, this commit removes certain header
include paths which were maintained for backward compatibility.
Memory check (leaks and heap tracing) functions for unit tests
now have a separate file now and are renamed for more consistency.
BREAKING CHANGE: renamed memory check function names which may be used
in unit tests outside IDF.
* changing dependencies from unity->cmock
* added component.mk and Makefile.projbuild
* ignore test dir in gen_esp_err_to_name.py
* added some brief introduction of CMock in IDF
