* Description of unregistering was incorrect
* Made clear that event loop arg mustn't be NULL
* Added parameter check in create function
Closes https://github.com/espressif/esp-idf/issues/6761
Closes IDFGH-4969
Using xxx_periph.h in whole IDF instead of xxx_reg.h, xxx_struct.h, xxx_channel.h ... .
Cleaned up header files from unnecessary headers (releated to soc/... headers).
New unity component can be used for testing other applications.
Upstream version of Unity is included as a submodule.
Utilities specific to ESP-IDF unit tests (partitions, leak checking
setup/teardown functions, etc) are kept only in unit-test-app.
Kconfig options are added to allow disabling certain Unity features.