WIP: External tests revised

• set of tests to actually check if the creators that each library adds can actually instantiate an object
• changes to external interfaces to force classes that take A_GIMME to instantiate with no arguments (some are still outstanding which we don't yet test for)
• ported imagebang from tof (since I had to change the interface to get it to instantiate without args)
• fixed up some parts of the loader-- [declare -lib] now works with absolute paths, and external kludge classes to accommodate aliases now create properly with namespace prefixes
• put a stop-gap number of objects to check for in the test to make sure a build fails if something prevents externals from getting installed