This adds:

• Touch-specific cursor that "unclutters" away
• Keyboard driven navigation
• Volume-keys/power driven navigation

This fixes:

• Accidental mouse cursor on some devices (oneplus-oneplus3)

There isn't much to show, but along the way some other misc. changes happened

• Icons for the battery status
• Battery status in boot gui (previously part of examples/hello)
• Shared codebase for the UIs

The latter point is quite nice, as it reduces the amount of code specific to one component, and is the next step in the direction of implementing even more complex interfaces during early boot.

This was all done with the goal of soon adding more to the boot flow.

The main noticeable things are:

• New line of text under the logo
• The generations list is in a "sub menu", rather than "as a tab"

At this point, we're "officially" not using LVGL anymore. The core still is basically LVGL, but now the API is diverging.

Not shown: all the code part of lvgui and mruby-lvgui.