Add Java language support

QBS should support the Java language.

This is necessary to implement Android support.

Things needed:

• Java module
• File tagger for .java files
• Compiler for .java files -> .class
• Some way to create .jar files; this shouldn't be the same as how C++ is .cpp -> .o > .exe by default, since the developer may not necessarily want a .jar. Also, there are executable jars (analogous to .exe) and non-executable jars (analogous to .dll)
  • A way to specify the properties of the MANIFEST.MF file
• Property to specify the Java language version to the compiler (1.4, 1.5, 1.6, 1.7, etc.)
• Support for *.jar and *.class files in the run sub-command