v3: Add in config option
v4: Bugfixes
v5: Force a redraw upon exiting
v6: keypress-in-chargeonly mode enables mass storage (and vice versa)
v7: Fix bootloader builds
v8: Update manual, and have bootloader respect keypresses
v9: Change default to mass storage (ie no change in behavior)
todo:
* test-build dx50/dx90
* Switch from yes/no to proper menu?
* prevent WPS progress bar from drawing over us
Change-Id: I82e0ccb08497b7a5aa756ce77f1332ee963703a7
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Change-Id: I7946cf240b18a4fa8ace5e25e1eb6e97b8b12d7c