Upgraded to scintilla 3.3.4

Signed-off-by: Sven Strickroth <email@cs-ware.de>
applied backgroundcolors.patch

Signed-off-by: Sven Strickroth <email@cs-ware.de>
Merge branch 'scintilla-3.3.4'
Fixed issue #1833: Fast-Forward rebase does not preserve SHA-1 of commits

Signed-off-by: Sven Strickroth <email@cs-ware.de>