Add missing copyright notices
Add SLF4J simplelogger.properties to each tool

These properties are simple enough to be copy-pasted instead of
sharing by using appropriate Maven configuration.
Unify CLI interface for XMvn tools
Refactor repository code

Convert repository code to use "abstract factory" pattern instead of
previously used "prototype".
Move repo configurator from o.f.x.repository package
Use StAX instead of XPP3