CLI Refactoring

[tricoder42]

Tracking issue to fix CLI related bugs and added requested features:

• Fail on missing translations ([Feature request] Check for missing messages and exit with error code if found #65)
• Remove dead translations (Feature Request: Remove dead translations #59)
• Custom formats of message catalogs (Feature Request: Custom formats of message catalogs #56)

Moved to later:

• TypeScript support (Extract messages from TypeScript files #48)
• Update tutorial about catalog format (messages.json is looking different than in documentation #53)

[codecov]

Codecov Report

Merging #68 into master will decrease coverage by 9.2%.
The diff coverage is 39.83%.

@@            Coverage Diff             @@
##           master      #68      +/-   ##
==========================================
- Coverage   99.84%   90.64%   -9.21%     
==========================================
  Files          28       34       +6     
  Lines         652      759     +107     
==========================================
+ Hits          651      688      +37     
- Misses          1       71      +70

Impacted Files	Coverage Δ
packages/lingui-conf/src/index.js	100% <ø> (ø)	⬆️
packages/lingui-i18n/src/select.js	100% <ø> (ø)	⬆️
...s/babel-plugin-lingui-transform-react/src/index.js	100% <ø> (ø)	⬆️
packages/lingui-cli/src/api/stats.js	0% <0%> (ø)
...ckages/lingui-cli/src/api/extractors/typescript.js	0% <0%> (ø)
packages/lingui-cli/src/lingui-extract.js	17.64% <17.64%> (ø)
packages/lingui-cli/src/api/extractors/babel.js	33.33% <33.33%> (ø)
packages/lingui-cli/src/api/formats/lingui.js	38.09% <38.09%> (ø)
packages/lingui-cli/src/mocks.js	75% <75%> (ø)
packages/lingui-cli/src/api/extract.js	75% <75%> (ø)
... and 7 more

---

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[codecov]

Codecov Report

Merging #68 into master will decrease coverage by 9.67%.
The diff coverage is 47.94%.

@@            Coverage Diff             @@
##           master      #68      +/-   ##
==========================================
- Coverage   99.84%   90.16%   -9.68%     
==========================================
  Files          28       34       +6     
  Lines         652      773     +121     
==========================================
+ Hits          651      697      +46     
- Misses          1       76      +75

Impacted Files	Coverage Δ
...ckages/example-usecase/src/Usecases/NeverUpdate.js	100% <ø> (ø)	⬆️
packages/lingui-cli/src/api/compile.js	100% <ø> (ø)	⬆️
packages/lingui-react/src/I18nProvider.js	100% <ø> (ø)	⬆️
...s/babel-plugin-lingui-transform-react/src/index.js	100% <ø> (ø)	⬆️
packages/lingui-conf/src/index.js	100% <ø> (ø)	⬆️
.../example-usecase/src/Usecases/ElementAttributes.js	100% <ø> (ø)	⬆️
packages/example-usecase/src/Usecases/Children.js	100% <ø> (ø)	⬆️
packages/lingui-i18n/src/select.js	100% <ø> (ø)	⬆️
packages/lingui-cli/src/api/stats.js	0% <0%> (ø)
packages/lingui-react/src/Select.js	100% <100%> (ø)	⬆️
... and 17 more

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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