RC1 v0.37.5 Cherry Picks

[alexanderbez]

v0.37.5-rc1 cherry picks:

• fix DecCoins constructor #5410
• Fix Uint#LTE #5399
• Bump github.com/spf13/viper from 1.5.0 to 1.6.1 #5375
• R4R: Sortable Decimal Bytes #5360
• Allow node to restart after halt config trigger #5352
• Bump gopkg.in/yaml.v2 from 2.2.5 to 2.2.7 #5331
• Bump github.com/tendermint/tendermint from 0.32.7 to 0.32.8 #5330
• Add BigInt() to Uint struct in types/uint.go, update tests #5325
• Fix IAVL Iterator Race Condition #5279

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For contributor use:

• Targeted PR against correct branch (see CONTRIBUTING.md)
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Code follows the module structure standards.
• Wrote unit and integration tests
• Updated relevant documentation (docs/) or specification (x/<module>/spec/)
• Added relevant godoc comments.
• Added a relevant changelog entry to the Unreleased section in CHANGELOG.md
• Re-reviewed Files changed in the Github PR explorer

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For admin use:

• Added appropriate labels to PR (ex. WIP, R4R, docs, etc)
• Reviewers assigned
• Squashed all commits, uses message "Merge pull request #XYZ: [title]" (coding standards)

[codecov]

Codecov Report

Merging #5418 into rc1/v0.37.5 will increase coverage by 0.27%.
The diff coverage is 83.72%.

@@               Coverage Diff               @@
##           rc1/v0.37.5    #5418      +/-   ##
===============================================
+ Coverage        50.99%   51.26%   +0.27%     
===============================================
  Files              290      290              
  Lines            18854    18873      +19     
===============================================
+ Hits              9614     9676      +62     
+ Misses            8547     8504      -43     
  Partials           693      693