Krayon for SBGN v1.0

Improvements

• applying style is now undoable
• added 'Apply Style to Diagram' keyboard shortcut.
• created tutorial video Styling Diagrams
• added videos and further diagrams to resource section of help dialog
• action search is now case-insensitive
• load and save dialog now share common parent folder

Bugfixes

• property changes to diagram features such as clone marker did not propagate correctly.