Reimplemented calculator panel
- collapsible toolbar panel is now also a freely movable "toolbaritem"
- drop the antiquated and deprecated "stausbarpanel"
- thereby: reduced code complexity, improved compatibilty, increased flexibility

Also
- some minor changes to localizations
- higher resolution icon
- some minor cleanup of code / typos in comments
Fix transitions which were broken in previous commit
input box wasn't focused when opening collapsed calculator with click on icon
delete translations for removed seting "settings.addonbar.show"
minor code cleanup
Merge pull request #2 from Ede123/collapsible_input

 Reimplementation of collapsible calculator panel