Original work by @ourairquality
* Sysparam threadsafe and SPI access
* Sysparam test cases
* Fix for negative int8
* Sysparam getting bool without memory allocation. Bool tests.
* SPI flash refactoring.
* Extract common spiflash.c into core.
* Use spiflash.c in sysparam.
* Use memcpy in spiflash.c insted of hand-written version.
* Tests for spiflash.c
* Sysparam implementation
sysparam improvements
Mostly done, a few minor cleanups left.
Add sysparam_editor example
Sysparam code cleanup
Add documentation to sysparam.h
Fix up sysparam.h docs
Added a couple more debug statements
Fix potential memory leak if realloc() fails
Major sysparam overhaul
Add sysparam_get_info function
Add sysparam initialization to app_main.c
* Fixed warnings, added license
