Improve bar line Inspector and Palette

**Inspector**
- Align span combo item names with palette names
- Add a [Custom] span item: it is informative only, cannot be selected and is set by the Inspector for spans which do not match any built-in span
- Implement proper selection of span combo item when a bar line is selected in the score
- Enable/disable type combo items according to bar line type (repeats cannot be turned on/off for individual bar lines)
- Implement spanTypeActivated() to set in the score the span selected in the Inspector

**Palette**
- Labels for styles and spans made clearer (hopefully...)
fix #28041: image z-order
Added selection range filter to Select Window
Bar line inspector consistency for span data

- Selecting a built-in span type updates other span values
- Added a check function enforcing correctness and consistency of span data (Span, From, To); it also set spin box mins and maxes to avoid meaningless values (like From below To and so on)
- Removed array of built-in span type data; span type are different enough to make a table useless: ad-hoc code is needed for most of them.
- Removed legacy, commented-out code
- Set mins for span value spins in .ui
- A few typos here and there
More legacy code removed
fix #12960
Added test for paste of 2 voice
Added voice data to staff mime.
Changed paste staff behavior to overwrite only the voices included in staff mime.
Merge pull request #1056 from mgavioli/Improve_barline_inspector_and_palette

Improve bar line Inspector and Palette
Added SelectionWindow class.
Added selection filter class.
Added selection filter object to score.
Added communication between selection window and selection filter.
Added example filtering for dynamics.
Added updating of selection window when switching scores in musescore.
Added const modifiers
Moved canSelection function to SelectionFilter class

Conflicts:
	libmscore/select.cpp
	libmscore/select.h
Added function that sets selection filters.
Made xml aware of filter

Conflicts:
	libmscore/xml.h
Added test suite for selection filter.
Added compare and save mime data function in testutils.
Added test for dynamic filtering.
Added filtering of articulations.
Added test for articulation filter.
Created a general function for filter type testing.
Moved selection window labels to an array.