Modified the project structure, removed module extension and went instead for a non-complete core dependency graph

Semi-encapsulated the core/api dependency graphs and created a proper structure to load eager singletons

This should make it possible to develop the core in Eclipse without the ADT.

The project is now built as an Android project (via Eclipse or
ant). Tests have been moved to a separate project so they can exist
outside the Android build process. A basic Android app structure has
been created. A Bluetooth plugin for Android has been added, and the
Bluetooth plugin for J2SE has been modified to use the same techniques.