[lang] Initial reflection checkin

[Stephen Colebourne <sc...@btopenworld.com>]

I have committed the initial versions of the reflection code to commons
proper.

- ClassUtils and ArrayUtils are in the main lang package as they do not use
reflection
- the other classes are in a reflect subpackage
- none of the classes have tests
- MethodUtils is almost completely broken
- ConstructorUtils has issues
- FieldUtils should work

Main questions are

- is the API OK?
- should we cache?
- any reflection things I've missed?

This code could really do with a review from another committer at this point
;-)

Stephen


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