* development: (141 commits)
Add missing CHANGELOG entry for OrderWatcher WS interface
Bump up stale to close to 30 days
Move onMessageAsync outside of tests and add comments
Fix WS tests to remove race-condition and be more specific about the message expected
Add temporary console.log to test failing on CI
Make @0x/contracts-test-utils a dependency instead of a devDependency
Fix test-publish failure in contracts packages
Fixed solhint errors
Added documentation to `LibAddressArray.append` and switched `if` to `require` smt
Updated changelogs for new contracts
Added `gas` field so tests pass on Geth;
Added Changelog for new Extensions
Updated comment `Execute fillOrder` -> `Execute exchange function`
Explicit returns
Prettier / Linter on contracts + TS
Refactoring balance threshold filter
Moved exchange calldata functions to separate mixin
Less Assembly. More Solidity. Less Efficiency. More Readability.
Run all tests for extensions
Cleaned up tests for balance threshold filter
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