Add icon on the Type column to indicate the default interpolation of the parameter
Remove extra string that was used to indicate the interpolation type, now indicated by the icon.
Add icon on the Type column to indicate the static status of the parameter
Remove "(Static)" string that was used to indicate the static status, now indicated by the icon.
Comment unneeded output information
Remove unneeded CanvasTreeStore model property 'interpolation'
Restore string that indicates the value node local name when the value description is not constant.

This was removed accidentally in a previous commit. Also the is_animated is replaced by the negation of is_constant, because strictly the is_animated doesn't return true for linkable value nodes.
Layer_Sphere: migration of parameters to ValueBase type.
Move the static option for parameter blend method from ParamDesc to Layer_Composite
Layer_Stretch: migration of parameters to ValueBase type.
Layer_Stroboscope: migration of parameters to ValueBase type.
Layer_Spersample: migration of parameters to ValueBase type.
Add missing commands in the previous commits
Layer_TimeLoop: migration of parameters to ValueBase type.
Translate: migration of parameters to ValueBase type.
Twirl: migration of parameters to ValueBase type.
Warp: migration of parameters to ValueBase type.
XORPattern: migration of parameters to ValueBase type.
Zoom: migration of parameters to ValueBase type.
FilledRect: migration of parameters to ValueBase type.
Turn feather and bevel sizes to distance, so they can be entered using the application unit used.