add general bracket-quote support to cmake HL
add general bracket-quote support to cmake HL

Expand on previous commit by adding general support for bracket-quoting
of comments and strings to CMake highlighting. Like RST support, this is
new to CMake 3.0.

jfmcarreira/kate,DickJ/kate,jfmcarreira/kate,hlamer/kate,hlamer/kate,DickJ/kate,hlamer/kate,hlamer/kate,DickJ/kate,hlamer/kate,cmacq2/kate,sandsmark/kate,jfmcarreira/kate,DickJ/kate,hlamer/kate,hlamer/kate,sandsmark/kate,sandsmark/kate,hlamer/kate,hlamer/kate,sandsmark/kate,cmacq2/kate,hlamer/kate,cmacq2/kate