Images format control

Watchfaces images can have different types,
in binary watchface file, but not EasyFace editor.

To control it EasyFace compiler use specific postfix in widgets Name.
It works for widgets of type Image, and title of filename of preview

Name of such elements can contain _RGB or _RGBA ending.

_RGB => rgb565 (2 bytes per pixel, it takes lower space, but has no alpha channel)
_RGBA => 32bit RGB with alpha channel, i.e. transparency (4 bytes per pixel)

Tips to use

watch gen2 has no compression, so its better to use everywhere where possible RGB
RW2, MB8 watch sometimes better to use RGBA, where transparency required,
these watches has compression, so its not so important for size,
for example, a fully transparent RGBA image may use as Tap zone

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