Setup .rsc files unencrypted

.rsc files are unencrypted. Code shouldn't be trying to encrypt them
going forward.
Removed EncryptDataFile

EncryptDataFile was used to encrypt and decrypt the .rsc graphics files.
As the project is now open source, and the base graphics are available,
the encryption was simply added complexity with no benefit.

The Declare call for the EncryptDataFile from OdysseyDLL was left in
place but commented to document its existence.
Merge pull request #9 from HybridGames/develop-remove-encrypt

Merging in code with Encryption for .RSC files removed.