Add MPQ extraction example

GC file iterators

Support file iteration

Update for Lua 5.3 final release

Use uppercase for enum constants

Convert `moonstorm_` prefixed functions to `ms_`

Fix typo in example code

Check to see if the handle is already closed in GC metamethods

Support patched MPQs

Implement finalizers for MPQ and file handles

Adding license header

Merge branch 'wrapped-handles' into development

Make MPQ handles parents of file handles

Support hierarchies of wrapped handles

Use wrapped handle for MPQ file API