Support multiple inputs to generate cardinals and ordinals

[zbraniecki]

This patch adds support for ordinals alongside cardinals.

The approach I picked is to switch the signature of the client side app to take two arguments -i and -o, where -i can be one or more paths. This allows for passing just one json, or multiple (cardinals and ordinals).

Then, I modified logic in the codegen crate to generate a nested match in get_pr that takes PluralRuleType and locale, and changed the LOCALES array to be a new function get_locales that also takes PluralRuleType.

This change should make it easier to implement the IntlPluralRule structure that will accept locale/pluralruletype in constructor and number in select.

[coveralls]

Pull Request Test Coverage Report for Build 28

• 76 of 92 (82.61%) changed or added relevant lines in 4 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+1.4%) to 34.043%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
make_pluralrules/src/parser/gen_rs.rs	26	28	92.86%
make_pluralrules/src/lib.rs	45	49	91.84%
make_pluralrules/src/main.rs	0	10	0.0%
<!--	Total:	76	92	82.61%	-->

Files with Coverage Reduction	New Missed Lines	%
make_pluralrules/src/main.rs	1	0.0%
<!--	Total:	1		-->

Totals
Change from base Build 27:	1.4%
Covered Lines:	496
Relevant Lines:	1457

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💛 - Coveralls