shapeinplace: stub

Make a copy of editinplace.py
Include it in musicview context menu
shapeinlplace: Remove autocompleter, matcher, analyzer

The widget will only edit a shape, so it doesn't neet these elements
shapeinplace: modify inserting text to document

This does nothing useful, but is used to see how inserting works
shapeinplace: Remove View

Isn't necessary: We'll construct a dialog only with UI elements and no text editor
shapeinplace: start implementing it as QDialog