* Pad image to 1MB and add simple checksum
* Test code to verify firmware checksum
* Comment out unneeded zlib
* Add files via upload
* Print space remaining in ROM
* Append checksum to external apps too
* Check external app checksums when loading
* Is it 2024 already?!
* Validate firmware checksum before flashing
* Add files via upload
* Added flash error warning to nav screen
* Clang
* Replaced some hard-coded values with #defines
* Check FW checksum before USB serial flash too
* Add files via upload
