Conversions: support "out_unit in count in_unit" style queries.

Expansion of the 'in hack' to figure out which is in which.

Fixes #673.

cc: @mintsoft
Merge pull request #674 from duckduckgo/mwm/conversions

Conversions: support "out_unit in count in_unit" style queries.
Goodies Templates: update some goodies for auto-template usage.

Testing these in duckpan will depend upon the changes in that repository
being integrated.
ABC: updated with structured answer.

Includes a possible technique to encode multi-inputs for
auto-templating.
Ascii: update with structured answer.
AspectRatio: update with structured answer.
ZappBrannigan: add structured answer
CalendarConversion: move to structured answer.
Passphrase: add structured answer.
WhereAmI: add structured answer.
Morse: add structured answer.
DateMath: add structured answer.
HexToASCII: add structured answer.
Jira: add structured answer
Base64: use structured answer.
DuckDuckGo: add structured answer.
ReverseComplement: add structured answer
HelpLine: add structured answer.

Also, restructure data sources to make it easier for non-technical
people to contribute.
Braille: use structured answer.
Factors: use strcutured answer.