Converted ImageInfo in public structure, use it to cache and
	interchange information about disc image.
	Corrected typo.
	* DiscImageChef/Checksums/CDChecksums.cs:
	  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
	Implements verification on all currently supported disk
	images.
	Implements DC42 CRC calculation.
	Calculates TeleDisk CRC for disk sectors.
	Resolves #2 and bumps version to 2.1.