Fileseq

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* cmd/seqinfo - New tool for parsing and printing info about one or more file seq patterns
* Refactored vendoring into cmd/ location

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* waf c++ build flags updated for static lib to avoid errors about -fPIC when link into another C++ lib

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* 6 - Bug: Single frame parsing for padding and zfill does not match py-fileseq
* 7 - Feature: Allow option for changing frame padding styles (i.e. to something like Nuke)

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* cpp - New C++ bindings on top of gofileseq

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* cmd/seqls - Detect symlinks to directories and don't interpret them as discovered sequences

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* Major refactor to the underlying logic of resolving ranges. Use an optimized storage and iteration approach, in order to
handle arbitrarily large ranges. Avoids memory allocation crashes, and very slow construction of FrameSet/FileSequence

Known Issues:
* While creating a FrameSet from a massive range like "1-10000000000x2" will be very quick, creating
FrameSets from multi-ranges with massive components like "20,50,60-10000000000" may be slow.
Improvements are still needed to the process of detecting unique values in the previously added
range components.
* Invert/Normalize functions are not as optimized as they could be. While they are much faster now for the common case of source
ranges like "1-10x2,50-100x3", they are significantly slower for less common cases where the source range is a massive amount
of individual values like "1,2,3,4,...,100000"