graphics: remove unused images
graphics: add bootmenu images
bootmenu: add display functions for menu images
battery check: remove for 2ndboot
fastboot-countdown: shorten and set a reset time (same)
makefile: swap images out
adjust TEXT_BASE for 2ndboot
fastboot: bootmenu handling
fastboot: change VID/PID to Google 18d1:0100
freedom patch: allow unsigned kernel load