Keep Scintilla's directory structure mostly and only remove unused lexers.

For now, this will break the build. The build systems have to be updated as well as scintilla_changes.patch.


git-svn-id: https://geany.svn.sourceforge.net/svnroot/geany/branches/unstable@5437 ea778897-0a13-0410-b9d1-a72fbfd435f5