fix(display): Do LVGL task processing in main on POSIX.
An SDL/Zephyr bug prevents proper display when SDL calls are
made from anything but the main thread, so add task handling
in our simple main function when on POSIX.
fix(usb): Compilation fix for 64-bit targets
Properly handle differences in the size of `size_t` on 64-bit
architectures.
fix(display): Imply, but don't force, LVGL mono theme
Some targets may be using color displays, so instead of forcing
on the mono theme, merely imply it to default it
Add CONFIG_ZMK_DISPLAY_INVERT Kconfig to invert colors
(black-on-white to white-on-black) on monochrome screens.
Currently applies only if CONFIG_LV_USE_THEME_MONO is selected,
which is the default unless user overrides it.
All displays currently used with ZMK are monochrome so it makes sense
to enable the mono theme by default, which can be disabled by the user
since we use the "imply" statement.
Without this theme setting, the small font size selection for widgets
at the bottom of the stock status screen does not work.
* LV_ prefix from new LVGL official Kconfig now used.
* API changes for themes, container object removal, etc.
* Add our own Kconfig and code for theme default small font.
* Remove some hardcoded sizes.
* Add new Kconfig settingsx to allow selecting system or dedicated
work queue for performing UI updates.
* Allow UI updates to not block other system tasks when display is
updating, especially important for e-ink displays.