Fine-tune interpolation type icons and using all icnos in one sif file concept to enable easy maintainance
Delete unused sif interpolation type icon files
Cleanup by removing unused sif files according to the interpolation type icons update
Update canvas panel and import image layer icons

Since 0.64.0, we introduced a new icon for parameter of canvas, to have a consistant
icon metaphor, we update canvas and import image layer icons accordingly.
Add skeleton layer icon.
Add initial version of Stroboscope icon.
Correct the canvas panel icon
Use stroboscope and skeleton layer icons for layer tree
Add forbid animation icon(used in paramerter panel)
Make parameter list uses forbid animation icon instead of animate mod off icon

So that we can have consistant looking of icons for parameter panel.
Use cartoonish duck instead of dog for import image layer
Polish time track panel icon by add some more details
Update value node (link) icon
Fix ease waypoint icon by add two straight lines
Merge https://github.com/synfig/synfig
Merge branch 'master' into icons_update
Fix lines position for ease waypoint icon on time track panel
Update waypoint icons with tango color palette on time track panel
Apply tango dark(Aluminium) for waypoint icons outline
Merge pull request #73 from jcome/icons_update

Icons update