#3842: Model refactoring. These models are verified with desktop:
Brackets contain the superclass of the model.

AngleArcSizeModel            - ok (OptionsModel)
AnimatingModel               - ok (BooleanOptionsModel)
AuxObjectModel               - ok (BooleanOptionsModel)
BackgroundImageModel         - ok (BooleanOptionsModel)
ButtonSizeModel              - ok (OptionsModel)
ColorFunctionModel           - ok (OptionsModel)
ColorObjectModel             - ok (OptionsModel)
FixCheckboxModel             - ok (BooleanOptionsModel)
FixObjectModel               - ok (BooleanOptionsModel)
GraphicsViewLocationModel    - ok (OptionsModel)
IneqStyleModel               - ok (BooleanOptionsModel)
LayerModel                   - ok (MultipleOptionsModel)


git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@30179 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Layer model fix by Laszlo (#3842)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@30180 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
web: "dilate" and "segment with given length" dialog already not using prompt. (#3769)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@30181 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e