Reviewed-by: hjk

Reviewed-by: Roberto Raggi

Reviewed-by: hjk
Reviewed-by: Erik Verbruggen

Reviewed-by: Christian Kamm

Reviewed-by: Roberto Raggi

Make DebuggerRunner handle QProcess::startFailed
correctly on Windows (synchronous signal emission
within startDebugger()).
Remove debug output/warnings.

Reviewed-by: hjk

(cherry picked from commit 519f1d11947ff3109850e559fae868c4a55deb43)

Makes them easy to use everywhere. Also when calling
QuickFixData::textOf and friends, it wasn't really clear which file
they would run on.

This will allow a more efficient and direct implementation.

* Can change files without opening an editor.
* Can open an editor without changing a file.
* Default to reindenting new files.
* Allow reading a file temporarily to access document and text.

For answers to questions about where to insert a snippet/chunk of C++ code. Ok,
currently it will only find the One And Only place to insert method
declarations in classes, and it will need some tuning.