Remove obsoleted OpcodeLSL_RegImmed, OpcodeLSR_RegImmed and OpcodeASR_RegImmed.
Implement overrided abstract method execute() in ThumbOpcode for Format 1 opcodes.
Added a static 2d array member for storing all opcodes in ThumbOpcode for easy access.
Switching to the above 2d array instead of the 2d array in Thumb.