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Also added some other helper macros:
* OIS_INLINE_PRAGMA
* OIS_MACRO_BEGIN
* OIS_MACRO_END

classes that can't have them automatically generated, to avoid warnings
under MSVC.

Add copy constructor for Exception, since throwing it requires a copy
constructor.

Make KeyEvent::key non-const to allow automatic generation of
assignment operator and copy constructor.

Strangely Effect had an implementation, though it's still private

Making xinput/xbox support optional (defaults to false)... don't force OIS users to have to distribute yet another possibly unwanted redistributable.

Upping version to 1.4.0