Function Request - Copy, Clone, Reverse, First, Front, Back, Last, Size

[justincpresley]

This closes the function request issue #10 that I created.

Additions:

• Copy(): Produce a copy of a OrderedMap object
• Reverse(): Reverse a certain OrderedMap object
• First() and Front(): Alias for Oldest
• Last() and Back(): Alias for Newest
• Tests for Copy and Reverse

Notes:

• Copy could technically be optimized via some memory library but this should be performant enough without causing too much overhead.
• Reverse could be more readable if the generic list library implemented a reverse function, nevertheless its just as efficient.
• I decided against Keys() and Values() at least for now due to mis-interruptions and limited use cases.
• You might notice that First, Front, Last, and Back are technically not aliases as they do not call Oldest and Newest. I leaned on the side of efficiency (bypassing the function call) because the definition is a one-line / straightforward.

I am happy to make any changes upon request.

[justincpresley]

I've now added some original map functions:

• Range(): apply a function to all key-value pairs
• Clone(): alias for copy
• Size(): alias for len