After main() returns, don't enter a busy loop but call epic_exit() to
signal to epicardium that the l0dable has finished.  The exit code will
be the return value from main().

Signed-off-by: Rahix <rahix@rahix.de>

Add blitting function to display

See merge request !349

change(bsec): Update documentation

See merge request !444

See merge request !443

change(main): rc3 splash

See merge request !442

fix(menu): Turn on MSC when no apps available

See merge request !440

feat(main): Show git info as overlay

See merge request !441

feat(ptt): Add demo app

See merge request !439

feat(hid-demo): Allow keeping buttons pressed

See merge request !438

feat(bsec): Add to BME680 demo

See merge request !435

Basic PTT implementation

See merge request !436

change(ble): Remove unused battery service

See merge request !437

It was never properly implemented and only leads to confusion.

BSEC support

See merge request !380