Interpolation type icons: tcb, linear, ease, const, clamped

All these icons are placed in the same sif file in different layers(groups)
and use time line/keyframes to tech to render final icon files. We are
animation software so why not take advance of time :) The most
important is that we can easily control icon to have same appearance
in color and shape when they are in same sif file.
compare interpolation icons between new and old versions