Composer Eclipse Editor

Here it is, Composer Editor.

Changes:
- Separated the ui into it's own plugin `com.dubture.composer.ui`
- Deactivated the Composer Menu (it was basically everywhere, and annoying everywhere) functionality superseeded by the Composer Editor anyway

Things to rework:
- Update the submodule back to pulse00/Composer-Java-Bindings
- Executing Composer (it's a holy mess at the moment) see #15

Broken things:
- The Composer-Builder Stuff is broken, because I changed the Composer Model (see pulse00/Composer-Java-Bindings#3)
  - Basically, rework Automatic Build-Path Management (issue will follow)
- Require Dialog broken, actually can be deleted

fixes #12
fixes #20
fixes #21

gossi