Allow to suppress the Clang annotations while editing

While the inline annotations are quite nice, they may disturb the workflow if they appear during editing.

Especially during refactoring sessions, I prefer to move code around first and think about it before the final patch is ready. So, for some time the code may be invalid and the annotations just disturb.

It would therefore be nice to temporary disable single or all annotations. It may also be possible to disable annotations during editing for some time. The red and yellow underlines are much less disturbing and could stay.