Metamodel and wizard changes.

Metamodel is simplified i.e. removed FMUInternalVariable and FMUVariable
is a classifier for both internal variable and a superclass for FMUPort.

Completed import wizard with both FMU and Evetn-B component port
definition pages.

Added simple simulation master code (Java).
Metamodel naming and UI wizards.

- Updated UI import wizard for the metamodel changes;
- Minor tweaks and naming changes to metamodel.
Refactored FMU loading and EventBComponent persistence.
Minor fixes.
Added simulation dialog and fixed plug-in version numbers.