Cmake utilities

This component is aiming to provide some useful CMake utilities outside of ESP-IDF.

Supported features:

project_include.cmake: add additional features like DIAGNOSTICS_COLOR to the project. The file will be automatically parsed, for details, please refer project-include-cmake.
package_manager.cmake: provides functions to manager components' versions, etc.
gcc.cmake: manager the GCC compiler options like LTO through menuconfig.
relinker.cmake provides a way to move IRAM functions to flash to save RAM space.
gen_compressed_ota.cmake: add new command idf.py gen_compressed_ota to generate xz compressed OTA binary. please refer xz.
gen_single_bin.cmake: add new command idf.py gen_single_bin to generate single combined bin file (combine app, bootloader, partition table, etc).

User Guide