Add try option to gen commands/functions (SYN-4942)

[mikemoritz]

• Also creates a few missing standalone storm functions
• Also fixes missing documentation for langByName

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@cf77998). Click here to learn what that means.
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #3030   +/-   ##
=========================================
  Coverage          ?   97.09%           
=========================================
  Files             ?      221           
  Lines             ?    43659           
  Branches          ?        0           
=========================================
  Hits              ?    42391           
  Misses            ?     1268           
  Partials          ?        0           

Flag	Coverage Δ
linux	97.09% <ø> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
synapse/lib/stormlib/gen.py	100.00% <ø> (ø)

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