Make CommonInstFormat a Subclass of CsInsn

[direwolf314]

CsInsn is basically the common format we already wanted. It also includes a ton of information about the instruction:

1. Operand types
   a. Register - needed for stack tracking - Identify Variables #17
   b. Immediate - good to know for Convert Between int/hex/char #10 and Implement Searching #19
   c. Memory access - Function and Address Following #30, Highlight Matching Occurences #34
2. Opcode types - Definitely needed for recursive descent Recursive Descent Algorithm #14 and future applications - Plugin Idea: Identify Possible Vulns #21, Future Enhancement Ideas #24

See (5) here for an idea of what I'm talking about.