Details:  accounted for >60% startup time in some cases and was
presumably only needed as help for a fallback when setting breakpoints
with gdb 6.5 on Windows

Task:     180315
RevBy:
Details:

This makes restoring sessions faster, but switching to restored documents for the first time
a bit slower.

Use _HPP for example for .hpp files, for example. Based on simply
putting the chosen extension in uppercase.

This code is already in TextEditor::BaseTextEditor::openEditorAt.

Small bugfix for column to jump to.

Current node can be 0.

Task:     - 244529
Details:  - It just doesn't work in Mac menus (at least not with Qt, but
I suspect it's some Mac thingy), so just don't do it.

- on windows, use the recommended way to interrupt a debugged process
- on unix, use SIGTRAP
- assorted minor improvements

rely on the inferior's pid being available. consequently, remove the
bizarre findChild stuff.

fixes interrupting processes with some versions of gdb

context

Details:  more consistent with the File menu

Details:  more consistent with the File menu

editor

workaround for getting the ShortcutOverride twice

Details: MinGW compilation

This check is no longer needed since the necessary private headers are
now part of Qt Creator.

Reviewed-by: Friedemann

Details:  re-use lineForPosition

Task:     -
RevBy:    Thorbjorn
AutoTest: -

RevBy:    - dt