refactor: cleanup create script

[raphinesse]

Motivation and Context

This takes the changes from the first four commits of #1191 and adds a few further simplifications in the affected code areas.

I pulled this out to reduce the scope of said PR and since I already reviewed this part of the changes.

Description

From #1191:

• Remove exported updateSubprojectHelp
• Remove exported update_cordova_subproject
• Renamed internal function update_cordova_subproject to updateCordovaSubproject
  • Refactored internal function updateCordovaSubproject to take in two static arguments:
  • projectXcodePath which is the path to project's xcodeproj
  • cordovaLibXcodePath which is the path to the CordovaLib's xcodeproj. (Note: it maybe a symbolic link when --link flag is added when installing platform)
  • Improved comments
  • Removed excessive supportive internal methods
  • AbsParentPath
  • AbsProjectPath
  • relpath
  • updateSubprojectHelp

New:

• Cleanup copyJsAndCordovaLib

Testing

npm t

[raphinesse]

I would actually argue that this change is not actually breaking, since I would not consider the removed module exports public API.

[codecov-commenter]

Codecov Report

Merging #1193 (0087bcc) into master (6396343) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1193   +/-   ##
=======================================
  Coverage   75.15%   75.15%           
=======================================
  Files          13       13           
  Lines        1658     1658           
=======================================
  Hits         1246     1246           
  Misses        412      412           

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