Update to Instruments.xml

An Electronic Instrument group has been added, for synthesisers,
theremins, etc. Some electronic instruments such as the Ondes Martenot
have been moved here, but not electronic organs. XML syntax has been
checked and all appears to be well.
change text in staff properties dialog
fix regression: position of instrument names
experiment new color and thickness for breaks and spacer to make them more discrete
rename icons according to FreeDesktop Icon Naming Specification
change icon set
Change Aeolus to Equal Temperament

The set temperament for Aeolus was Mean Tone which sounds out of tune to
our modern ears. I have therefore set the temperament parameter to 5
which is Equal Temperament.
Aeolus Changed to Equal Temperament

The existing temperament set fro the Aeolus Synth was Mean Tone which
sounds out of tune to modern ears. I have set that parameter to 5 which
is Equal Temperament.
Revert "Update to Instruments.xml"

This reverts commit cf52e3b50dfa411c8b4b0713da6c14c37849f550.
add align-vertical-baseline icon, fix alignment icons in Style->Text
fix resource file for Mac OSX
replace more icons
replace more icons, take 2
fix #11684: replace 'Display' by 'View' in the main menu
Merge branch 'master' of https://github.com/musescore/MuseScore.git
Merge branch 'InstrumentsXML-Update' of https://github.com/ChurchOrganist/MuseScore.git