[Decompile] vector.gc (finally)

[water111]

I think we now have everything to decompile vector.gc.

Current this is about half of it + tests. Everything out of the decompiler seems to be correct. Most of the work is figuring out their crazy naming conventions (what does vector-v*float++! mean??) and writing reasonable doc strings.

[coveralls]

Pull Request Test Coverage Report for Build 794000005

• 34 of 34 (100.0%) changed or added relevant lines in 5 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.02%) to 69.247%

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Totals
Change from base Build 790847500:	0.02%
Covered Lines:	34118
Relevant Lines:	49270

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💛 - Coveralls

[water111]

vector-cross! will return junk in w - need to update the tests to not print this.