Kepler

(This is a continuation of part of bug #2266, which included other stuff, so i
have closed that and opened this one for clarity)

Assigning to Laura as a first guess, but feel free to reassign to someone more
appropriate, as necessary.

The new SVG icon assignments are now mapped in two resource bundle files -

kepler/configs/ptolemy/configs/kepler/svgIconMappingsByClass.properties
and
kepler/configs/ptolemy/configs/kepler/svgIconMappingsByLSID.properties

svgIconMappingsByClass contains most (if not all) the actor classes in use, but
only a few of those classes have actually been mapped to icons, since I'm really
not sure which actors are supposed to use which icons, apart from the really
obvious ones I've already done. Most actors therefore default to a blank teal
icon at the moment.

The files listed above have lots of comments in them, describing exactly how to
do the mappings.