BREAK CHANGES(cleint): rename keynames to camelCase

[hiroppy]

• This is a bugfix
• This is a feature
• This is a code refactor
• This is a test update
• This is a docs update
• This is a metadata update

For Bugs and Features; did you add new tests?

Motivation / Use-Case

camelCase is very common in JavaScript world so I modified them from snake-case.

Breaking Changes

Yep

Additional Info

CI is broken so I'll fix it.

[codecov]

Codecov Report

Merging #2734 into v4 will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##               v4    #2734   +/-   ##
=======================================
  Coverage   92.88%   92.88%           
=======================================
  Files          39       39           
  Lines        1308     1308           
  Branches      350      350           
=======================================
  Hits         1215     1215           
  Misses         89       89           
  Partials        4        4           

Impacted Files	Coverage Δ
client-src/default/index.js	92.47% <100.00%> (ø)
lib/Server.js	96.33% <100.00%> (ø)

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[hiroppy]

Wait for #2734

[alexander-akait]

It creates breaking change for other plugins/servers/etc which connect to our socket server and send messages for reloading, I think it is really unnecessary to do it, no benefits from this

[hiroppy]

ok

[alexander-akait]

Anyway thanks for your work