Implement StringPropertyInterface to make it easier to use other string classes (refs #58)
add ColorPropertyInterface
Make use of ColorPropertyInterface in GUI
Merge remote-tracking branch 'origin/master' into property_interfaces
Allow for color codes with lower-case letters
Javascript backend: Update to changes in the property system, support arrays, colors, and nested properties
Update scripting example
scriptzeug: Remove javascript backend from public API, move to internal
Merge branch 'origin/master'
Merge pull request #60 from hpicgs/property_interfaces

Property interfaces