fix #22131: bad diatonic transposition of Cb, Cbb
remove precompiled header for Mingw :( see http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56926
Make some strings translatable
Merge pull request #595 from Jojo-Schmitz/translate_fotomode

Make some strings translatable
also B#, B## - and add test

transpose tests were not being run, it seems, but they do work, so I am
enabling them and adding a diatonic transpose test that includes a full
chromatic scale.
Merge pull request #596 from MarcSabatella/22131-transpose-cb

fix #22131: bad diatonic transposition of Cb, Cbb
fix #23976: Common Time and Alla Breve symbols in Create New Score too small
reenable bagpipe embellishment
add test for #23863
add staff back for bagpipe palette
fix #23973: Inspector works on only one element after select all similar
Fix clef change and courtesy clef display.

Clef changes and courtesy clef on/off display have several issues: changed clef is not always shown, courtesy clefs on/off is unreliable and so on.

In this fix:

- A clef change at measure boundary is always placed at the end of the previous measure (unless for the very first measure).
- This measure-final clef is never destroyed or re-created (the clef at the beginning of the next staff is managed by Score::layoutSystemRow() as before): this ensures a consistent context.
- Showing / hiding of a courtesy clef is managed by Clef::layout() rather than by Score::layoutSystemRow() as before.
- The clef change on measure boundary (always at the end of the previous measure and always present) is shown if:
-- there is not another clef at the beginning of the next measure (not a courtesy clef at all);
-- the score is set to show courtesy clefs
-- the previous measure is not the last of a repeat or of a section
-- the individual clef is set to show courtesy clef.
- In all other cases, the clef is hidden (i.e. laid out to a element without any symbol).
- The Clef Inspector is changed so that, if there is a pair of matching courtesy and main clef, their Show Courtesy flags are kept in sync (modifying either modifies both)
Default style, base style, saving and reading score file styles.

Background: the MScore objects has two reference styles:
- _baseStyle, which is inited to the built-in default style (common to all MuseScore copies)
- _defaultStyle which is inited to the user-defined default style
They are equal in a default installation but become different as soon as the user chooses a custom default style in the Preferences.

Issues:
- score style are saved as delta from the user-default style for texts and for articulations and as delta from the built-in default for the rest
- when the score is read back from file, it is inited to the user-default style and styles are read as a delta from it.

This makes:
- different parts of the saved style inconsistent among themselves
- styles saved in the score non-portable across different MuseScore copies (with potentially different user-default styles)

Fix:
- all style parts are saved as delta from the built-in default (to be portable)
- score is inited to built-in default style before being read from file.

Note: it is expected that users with custom default styles notice style differences when reading scores saved with previous 2.0 commits, as they were saved as delta from their respective user default styles.
use standard functions in pitch2xml instead of homegrown
add MusicMXL regression test script
add tablature testfile for B#, B##, Cb and Cbb
cleanup pitch2xml
cleanup pitch2xml
add testTablature3.xml  to tst_mxml_io.cpp
Merge pull request #603 from lvinken/23969-Cb-in-tab

23969 cb in tab