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.