Improved KDevelop teplates

This patch improves the template provided by KDevelop:

- Variable naming
- Indentation
- Included files
- CMake files (Version, install commands and readability)

If there are other things to improve in the templates, please let it know me.

REVIEW: 117656
Search and load qch files on startup in an specified directory.

Quick implementation for searching qch files in an specified
directory. The directory can be specified in the QtHelp Dialog.
KDevelop searches for the qch files on startup. The imported qch
files are NOT added to the manual documentation list. The default
icon is the qtlogo an the name is the basename of the file.

REVIEW: 117014