Beginning a major refactor - first thing to go can be that annoying long package name.
Refactoring and rewriting.
* A ClassCollection is basically a JAR file or equivalent.
* A Mapping is the same as before.
* A NameSet is an identifier for the type of names used in a ClassCollection, e.g. "1.4.7 Universal SRG"
Moved class and mapping I/O into a separate package.
Moved MappingLoader_MCP into the MCP package.
Removed unused code - including the command line entry point, for now.
Added command-line interface for what BON previously did from the command line, but more flexible (and more complicated!)
Updated README. Added LICENSE.