Adds the following improvements to the CMake editor:
* Indentation support (both through Ctrl+I and when pressing enter)
* Insertion of matching paranthesis and quotes (pressing '(' inserts ')')
Change-Id: If9a63b08b3e0897989e4d8ac69e3acc072b0b825
Reviewed-by: Daniel Teske <daniel.teske@theqtcompany.com>
