Initial work to support an ISDKManager implementation that only understands SBSv2 (meaning, no devices.xml support). This abstracts the common behavior of both SDKManagers into AbstractSDKManager but does not change API. SBSv2Utils is extended to encapsulate some repeated patterns to find sbs.bat.

source.uidesigner.jar = src/
output.uidesigner.jar = bin/
bin.includes = plugin.xml,\
               uidesigner.jar,\
               META-INF/MANIFEST.MF,\
               plugin.properties,\
               icons/