Initial version of the checked-c conversion tool. Current features:

[secure-sw-dev-bot]

This issue was copied from checkedc/checkedc-clang#33

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• Processes single C files or multiple C files (up to whole programs)
• Infers "ptr-ness" for local variables used in those programs.
• Re-write many source files
• Supports many aspects of the C grammar
• Contains unit tests

Current weaknesses:

• Macro support is limited
• Casting support is limited, needs structural type equality checks
• No inherent support for standard library functions.
• Doesn't honor existing checked C types

[secure-sw-dev-bot]

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