Shapetype mim-degradation, mim-phosphorylated, and mim-interaction

[Finterly]

The following ShapeTypes are minimally used.

Included in PathVisio 4:
mim-degradation - In ObjectPanel as Miscellaneous Shape, rename to DegradationIcon?

Not yet included in PathVisio4:
mim-phosphorylated
mim-interaction

[Finterly]

"Degradation"

Other ones are not really used