converted ch.elexis.eigendiagnosen to 3.0.0

converted ch.elexis.eigendiagnosen to 3.0.0, renamed ch.elexis.base.codeextension.eigendiagnosen,
ex/internalized just everything, some cleanup.
Added feature project and entries to pom.xml and category.

Working fine in my environment

Please look especially at feature/pom/xml...

Just a question: who is able to translate our strings into proper french??? I just left if in english - as the strings can be found in english for many other plugins, too - actually no good if we want to have french users...

Gruss, Harry