prototype runtime.autoEnv

[mlin]

Experimental feature: if the task runtime section declares autoEnv: true then WDL declarations with atomic types are automatically propagated to environment variables in the task container.

(atomic types: String, File, Directory, Int, Float, Boolean. Compound types can be passed this way via an intermediate String/File using sep, write_lines, write_json, or the like)

[coveralls]

Pull Request Test Coverage Report for Build 827142656

• 9 of 9 (100.0%) changed or added relevant lines in 1 file are covered.
• 2 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.06%) to 96.24%

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Files with Coverage Reduction	New Missed Lines	%
WDL/_parser.py	2	95.1%

Totals
Change from base Build 822169616:	0.06%
Covered Lines:	6654
Relevant Lines:	6914

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💛 - Coveralls

[mlin]

Closing as superseded by #617 / openwdl/wdl#504