* DiscImageChef/Checksums/ReedSolomon.cs:
Added ReedSolomon code.
* DiscImageChef/Checksums/CDChecksums.cs:
Detect pack mode+item and if in debug show it.
Subchannel Q is big-endian.
Detect if a CD-Text pack is really a CD-Text pack to not
confuse with CD+G packs.
An audio disc can have subchannel correct but channel null.
Viceversa can happen. Those should be considered correct and
not unknown.
Implement CD EDC and ECC checks.
* DiscImageChef/Checksums/CRC16Context.cs:
Implements CRC16.
* DiscImageChef/Checksums/CRC32Context.cs:
* DiscImageChef/Checksums/CRC64Context.cs:
Adds support to calculate custom CRCs on specified buffer.
* DiscImageChef/DiscImageChef.csproj:
DiscImageChef/Checksums/CDChecksums.cs