ResourceCompiler should be refactored as a Maven plugin

The org.geotools.resources.ResourceCompiler class parses the *.properties files and generates the following:

• The Resources_??.java files
• The *.utf files (binary)

The ResourceCompiler class should be removed from the referencing module and refactored as a Maven plugin insead. This plugin should be executed at Maven build time. It would allow us to remove the *.utf files from the SVN, since they would be generated by our Maven plugin.