VBCorLib Code

fix(SymmetricAlgorithmBase): Mode and Padding properties not throwing correct exception.
chore(SymmetricAlgorithmBase): clean up SymmetricAlgorithmBase tests.

fix(BinaryReader): was not correctly using Decoder causing subscript out of range error.

chore(all): removed CorArray.LengthFirstDim calls in favor of Len1D.

chore(all): remove unused duplicate code.

feat(UTF8Encoding): implement serialization.
chore(UTF8Encoding): finish implementing Encoding interface methods.

chore(UTF8Encoding): extend GetCharCount to decode chars for GetChars.
chore(UTF8Encoding): add decoder state support to GetCharsCore.

chore(UTF8Encoding): clean up GetString method.

chore(UTF8Encoding): re-implement GetCharCount and update GetChar methods to correctly allocate resulting char array.

refactor(UTF8Encoding): move duplicate code to subroutine.

chore(UTF8Encoding): add Encoder support to GetBytes and GetByteCount.