Add initial code, migrated from ij-core & ij-data

See:
https://github.com/imagej/imagej/tree/imagej-2.0.0-beta-7.9/core
LUTServiceTest: adjust for other LUTs present

Now that ij-data has merged with (the remains of) ij-core, there are
more LUTs present by default (38, to be exact). For now, let's adjust
the test to accommodate their presence, as well as the "bang" test LUT.