renamed arch/ to ir/
added basic tokenizer for C.
moved ssa code in its own file.
added a better way of iterating through each of the decompiler steps.
removed anything that has to do with stringification of expressions (should be done separately using the output of the tokenizer, for example).
all assignables are now indexable, so the ssa code can tag them properly.
began adding support for tracking expression size.
removed dependance on IDA for flow code.
removed code to stringify statements (should be done externally, using output of tokenizer, for example).
keep track of expression size while simplifying expressions (still experimental support)
separated everything that depends on IDA in 'dis' module (disassembler); this will allow for support of different hosts in the future.
removed dependance on IDA for filters/controlflow.py