MVP

This is a "minimum viable product" version of Centrinel.

Features:

• Notices annotations in C files that specify that a certain struct must live in a particular memory region
• Can issue warnings if pointers to such structs are present in code
• Can suppress the warnings (for known safe operations)
• Can scan either individual compiler invocations or a JSON compile_commands.json LLVM compilation database
• Can produce results either in plain text or in JSON format (for HTML report via centrinel-report) on stdout or in a file.
• Is running as part of the Mono static analysis CI job