en_AU instances, using StringGenBuilder in State classes

[etspaceman]

Changes Introduced

• en_AU (Australia) instances introduced
• StateLike classes updated to use a StringGenBuilder on zips for more flexibility

Applicable linked issues

Some progress towards #8

Checklist (check all that apply)

• This change maintains backwards compatibility
• I have introduced tests for all new features and changes
• I have added documentation covering all new features and changes
• This pull-request is ready for review

[codecov]

Codecov Report

Merging #32 into master will increase coverage by 1.30%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #32      +/-   ##
==========================================
+ Coverage   97.50%   98.80%   +1.30%     
==========================================
  Files          87       87              
  Lines         602      588      -14     
  Branches        1        1              
==========================================
- Hits          587      581       -6     
+ Misses         15        7       -8     

Impacted Files	Coverage Δ
src/main/scala/faker/Faker.scala	97.79% <ø> (-0.08%)	⬇️
src/main/scala/faker/ResourceLoader.scala	92.30% <ø> (+33.21%)	⬆️
src/main/scala/faker/SupportedLocales.scala	100.00% <100.00%> (ø)
src/main/scala/faker/address/StateLike.scala	100.00% <100.00%> (ø)

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