Fix some minor sub/ass parser issues
rpi/cec: Add VC_CEC_BUTTON_RELEASE debug
ass: Leave some debug printf() in which is ifdef'ed out
glw: Fix more issues related to missing screen refreshes when in conditional rendering mode
glw: Rename gr_schedule_refresh() -> glw_need_refresh()
glw: Add scheduled forced redraw of UI for various glw view functions
skin: If log is not visible, don't even load the views
glw: Increase math precision in sinewave()
glw: Rework padding/border/margin attribute implementations
glw: Remove GLW_SIGNAL_EVENT from generic signal dispatch
glw: Move pointer events out of generic signal handling
glw: Remove remaining signals that needed to return values from generic signal dispatcher
glw: Remove priorities from signal handling
glw: Do dynamic statement evals without signal handlers
glw: Optimize evaluation of dynamic statements
Fix double free()

Fixes #2070
glw/deck: Add missing cases for GLW_SIGNAL_RESELECT_CHANGED
Add support for On screen keyboard plugins

Fixes #1809
Put on screen keyboards in a category of its own
osk: Make captions on some buttons translatable