Convert lcd_activation callbacks to use the event system to allow for multiple parallel callbacks (for custom statusbar).
Increase maximum event count as we need more (I actually had a report about it during custom statusbar testing).
Removed corresponding functions from the core and plugin api. Bump min version and sort.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@23302 a1c6a512-1295-4272-9138-f99709370657
32 files changed