Remove KOBO_LIGHT_OFF_ON_SUSPEND option and move workaround to ffi/kobolight.ua
Add usage note to unschedule
fix rotation: viewport, not framebuffer

Rotation was always referring to the framebuffer's blitbuffer,
which in the case of devices with a viewport was not identical.
fix night mode setting

implement bezel cleaning with proper background color
Merge pull request #1110 from hwhw/master

Fix rotation with viewport, better night mode with viewport
Merge pull request #1111 from Frenzie/master

Remove KOBO_LIGHT_OFF_ON_SUSPEND option and move workaround to kobolight.lua