reorganize boardloader code #4564
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This PR reorganizes boardloader code: mainly SD card update functionality is separated into its own file, which allows easier reading of the main code.
Lazy initialization of display driver is introduced, to allow faster boot times. However, this is now enabled only for some models, as some bootloaders rely on display already being initialized. This is now fixed, as bootloader should always reinitialize the driver (and bootloader should deinitiliaze it on exit, which it luckily does incompletely - otherwise such bootloaders woudn't work properly.