Add bitmap file and indexed bitmap reader

[Brett208]

I apologize for the significant code change in this branch. This branch does the following:

• Improve our use of Bit Count checks and Indexed Bit Count Checks
• Move bitmap functions out of Write that should be shared with Reading or other tasks
• Create non-static/static pair versions of many bitmap functions
• Add a BitmapFile struct
• Add ability to read a standard indexed bitmap file

Testing needs to be improved in the Bitmap Reader. I held off on writing more tests for now because I'd like to create a way to check two in memory BitmapFiles for equaility. Then we can do round-robin checks, where we create an in memory bitmap file, save it to disk, load it, and check to make sure it is equal to the initially created struct.

I'm excited about these changes although I'm sure there is room for improvement.

-Brett

[Brett208]

I believe since we are forcing the padding to be byte aligned on BmpHeader and ImageHeader, we can use std::memcmp on them when comparing equality.

Next step is to actually read/write a file and compare the results in memory.

[DanRStevens]

I believe you are correct, in that memcpy should work given the assumptions we are already making here. There are no hidden fields or padding space that needs to be excluded from the comparison.