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* Heap init code improvements and updates Moved secondary heap init code to flash. External -24 IRAM, +32 IROM IRAM -76 IRAM, +64 IROM General updates to umm_init call path and DEFINES to better align with upstream. Name changes: UMM_INIT_HEAP with UMM_CHECK_INITIALIZED, umm_init_stage_2 with _umm_init_heap, and umm_init_common with umm_init_heap. Add file umm_cfgport.h to hold port-specific values. Stay focused on heap initialization only move-related defines. Improved comments. Created a wrapper function for running pre-SDK code from flash. Updated hwdt_app_entry to use it. Update umm_init with option to run from ICACHE. Added build define UMM_INIT_USE_ICACHE to move umm_init call path to flash. When used frees up 160 bytes of IRAM at a cost of 208 bytes of IROM Defaults to no change, umm_init call path will be in IRAM. * Changed default to use IROM for umm_init() and option to revert back to UMM_INIT_USE_IRAM.