redundant type definition cleanup

[gallayl]

• Added tslint-consistent-codestyle
• enabled "no-unnecessary-type-annotation" rule
• cleaned up code

[codecov]

Codecov Report

Merging #111 into develop will decrease coverage by 0.01%.
The diff coverage is 75%.

@@             Coverage Diff             @@
##           develop     #111      +/-   ##
===========================================
- Coverage    87.16%   87.15%   -0.02%     
===========================================
  Files          106      106              
  Lines         3133     3129       -4     
  Branches       736      737       +1     
===========================================
- Hits          2731     2727       -4     
  Misses         402      402

Impacted Files	Coverage Δ
...-viewer-react/src/models/DocumentViewerSettings.ts	100% <ø> (ø)	⬆️
...n-search-react/src/Components/Fields/TypeField.tsx	97.22% <ø> (ø)	⬆️
...-document-viewer-react/src/components/PageList.tsx	42.66% <0%> (ø)	⬆️
.../sn-document-viewer-react/src/store/RootReducer.ts	100% <100%> (ø)	⬆️
packages/sn-client-core/src/Repository/Upload.ts	99.21% <100%> (ø)	⬆️
packages/sn-authentication-jwt/src/JwtService.ts	93.47% <100%> (ø)	⬆️
packages/sn-redux/src/reducers/selected.ts	100% <100%> (ø)	⬆️
packages/sn-control-mapper/src/ControlMapper.ts	100% <100%> (ø)	⬆️
packages/sn-redux/src/Store.ts	92.85% <100%> (-0.25%)	⬇️
...ckages/sn-client-core/src/Repository/Repository.ts	100% <100%> (ø)	⬆️
... and 4 more

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