Fix installer issues, adding Matrix 6, Prophet 6, Prophet 12, ...

The 1.1.0 and 1.2.0 versions seemed to suffer from an installer problem that is hopefully fixed with this release.

A bug was fixed in the Roland JX-8P adaption, but this is still beta.
The Pioneer Toraiz AS-1 adaption now properly shows the patch names.

In addition, the following adaptions were added (untested):

• Oberheim Matrix 6
• DSI Prophet 12
• DSI Pro 2
• Sequential Prophet 6
• Sequential Pro 3