Change of .gitignore because of Eclipse IDE.

This was done automatically. I didnt do anything.
Started work on a simple Plugin-System.
Created really simple Plugin System!
Testing something.
Test did not go like planned. Chancelled testing.
Continued work on the Plugin-System.

Added events to make registration of new tools, effects, and menu-items
possible.
Changed the plugin-system a bit.

The system now only accepts jar-files with a 'plugin.info'-file, that
until now only contains the plugins main-class'es fully qualified
class-name.
Made ToolMenuItem and ImageMenuItem public.

For usage with the Plugin-System we all need to open up a bit. *joke*
adjusting the plugin manager
it keeps telling me to commit my changes. GRRR
merging pluginmanager