* convert projet to Maven

* only tested with linux
Update README.md

typo
Fix command in documentation
mavenize gtp module
clean up
* switch to SWT 3.6.2, which fix some glitch
Fix documentation
typo
* fix selected table track color (which is now visible when the track color is black)
* fix initiale dialog color with current track color
* fix track color button look and feel
* fix warnings around generics
* split TrackPropertiesDialog into an own class
* create ColorButton
* allow to select a predefined tuning

* tuning are stored inside TuxGuitar/dist/tuning-default.xml
* it contains some tunings for guitar, ukulele, bass, banjo
* add ./dist as share dir