added codelite project files to the gitignore

[underdoeg]

It's your call whether you want to merge this. I know that OF doesn't officially support codelite. But I don't think that those lines will conflict with any other IDE...

[bilderbuchi]

• Are all those user-specific IDE files? Cause currently, we package IDE files with addons because the PG can't create them yet (see Keep project files out of addons folders. #1) - we only ignore IDE project files which are specific to a user and should thus not be committed (e.g. C::B .layout files)
• could you move your changes into the IDE-specific ignore patterns (e.g. user-specific files) section of the gitignore file?
• From looking at it, the last rule correctly does not match codeblocks *.workspace files. Is that assumption correct?

[underdoeg]

• yes, those are user specific. sorry for the bad PR title...
• Sure thing, I'll move them.
• no it does not match .workspace codeblocks files. I know because codelite also uses a .workspace filename.

[bilderbuchi]

Alright then. We don't have a merge procedure here, but +1 to merge from me, and I'll let @benben merge if he doesn't have objections.
Thank you!