Details:  - Naming convention

Details:  - Conform to naming convention

The previous interface wasn't sufficient to properly support the Apply
button, since it didn't separate applying the changes from the cleanup
phase.

Designer settings pages still need some fixing.

Fixes Apply button causing problems for certain plugins, for example the
QuickOpen.

Details:  - Conform to conventions.

Details:  - To make it conform to naming convention.

It didn't make sure its Function* stayed valid. Now it does, by keeping
a copy of the list of CppDocuments (the snapshot) around.

Reviewed-by: Roberto Raggi

Task:     - 237723
Details:  - Look in the same directory first, then go through project's
files.

Introduced pp-scanner.cpp, renamed `pp' to `Preprocessor' and removed useless #includes.

Details:  in all pluginspecs.

Some people don't like this.

Necessary because the CppHoverHandler uses QtHelp and moved from
CppTools to CppEditor.

It used to be in CppTools, but since the hover handler only makes sense
in the context of the C++ editor, this is a better place.

Save settings instead of crashing. Sorry about that!

It is now possible to choose between case-sensitive or case-insensitive
completion. Also, you can now disable the automatic insertion of braces.

To match the class name, CppToolsPlugin.

This change removes a number of wrong usages of the CppModelManager::documents()/document().

Enables F1 for opening their help pages. Seems to work nicely.

The macro tooltip is supposed to be a fallback, since otherwise you
won't be able to see type information for macro parameters.

Reviewed-by: Roberto Raggi

In this case it's fast enough and sorting the list makes it easier to
find what you're looking for.

Though because of the substring matching, what you're looking for might
still be way down the list.

Reviewed-by: con