chore!: refactor & cleanup

[erisu]

Platforms affected

n/a

Motivation and Context

Refactor & Cleanup

Description

• Use arrow functions where possible
• Use template literals where possible
• Refactor selfEvents to events to remove the need of renaming the variable.
• Cleanup require block and ordering
• Remove unnecessary node shebang from files that not executable.
• Add static method version to match with other platforms
• Don't allow changing platform name when constructing new Api.
• Add async to methods where needed
• Converted Api to an ES6 class
  • Moved all static and non static Api methods to class
  • Converted prefixed _* methods to be private with #*

Testing

• npm t
• cordova platform add
• cordova run

Checklist

• I've run the tests to see all new and existing tests pass
• I added automated test coverage as appropriate for this change
• If this Pull Request resolves an issue, I linked to the issue in the text above (and used the correct keyword to close issues using keywords)
• I've updated the documentation if necessary

[codecov-commenter]

Codecov Report

❌ Patch coverage is 26.47059% with 325 lines in your changes missing coverage. Please review.
✅ Project coverage is 43.77%. Comparing base (bc68d15) to head (8012581).

Files with missing lines	Patch %	Lines
lib/Api.js	25.11%	322 Missing ⚠️
lib/browser_handler.js	40.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #155      +/-   ##
==========================================
- Coverage   44.00%   43.77%   -0.23%     
==========================================
  Files           4        4              
  Lines         800      795       -5     
==========================================
- Hits          352      348       -4     
+ Misses        448      447       -1     

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