breaking: add plugin support

[erisu]

Motivation and Context

• To create proper plugin support for Electron with Cordova's existing plugin system.
• To use a more secure and reliable way for loading remote content with out node integration. Use of contextIsolation & preload

Description

• Added ICP handler for plugin communication in the main process.
• API Change to pass plugin dir path to uninstall step for framework.
• Added framework un/install support with necessary parser changes.
• Added an exclusion to not overwrite the platform's installed node_modules and package.json
• Updated the exec method to support he new electron implementation but keep the browser fallback when electron is missing.
• Add the Cordova Electron's custom preload which is used to as a bridge between Cordova's exec & Electon's native ipcRenderer.
• Updated cordova.js's exec method to use the Cordova Electron's custom bridge.

Testing

• Built a project
• Created a custom plugin for Electron.

Requires

• chore: version bump to 3.0.0-dev #177

Checklist

• I've run the tests to see all new and existing tests pass
• I added/updated 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-io]

Codecov Report

Merging #175 (c032188) into master (d73fad4) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #175   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           14        14           
  Lines          625       652   +27     
=========================================
+ Hits           625       652   +27     

Impacted Files	Coverage Δ
lib/prepare.js	100.00% <ø> (ø)
lib/Api.js	100.00% <100.00%> (ø)
lib/PackageJsonParser.js	100.00% <100.00%> (ø)
lib/handler.js	100.00% <100.00%> (ø)
lib/parser.js	100.00% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update d73fad4...c032188. Read the comment docs.

[erisu]

Last call... Merging soon

[NiklasMerz]

I did a quick test with instructions from @erisu:

// Create a project
cordova create cordovaTest com.erisu.cordovaTest cordovaTest && $_
// Add Cordova Electron w/ Plugin Support
cordova platform add github:erisu/cordova-electron\#feat/plugin-support
// Add Cordova Device Plugin w/ Electron Support
cordova plugin add github:erisu/cordova-plugin-device\#feat/electron-support
// Build or run or what ever
cordova run electron --nobuild
cordova build electron
// Uninstall plugin test
cordova plugin rm cordova-plugin-device

The test went well and from my limited knowledge the code looks good. Go for it and bring plugins to electron!