Add Node.js environment setup

[jjw24]

Changes:

• Add support for installing Node.js for TypeScript/JavaScript plugins
• Add foundation for ensuring plugin environments are updated when a new Python/Node.js version is defined
• No prompts to reinstall plugin environments when flow is updated, changed between portable/roaming or moved to different portable location
• Consolidated Python and Node environment folders to a central location inside 'Environments' directory

Tested

• Fresh install of Python automatically
• User browse to custom Python directory and only able to select pythonw.exe
• Fresh install Node.js automatically when plugin.json's Language is TypeScript/JavaScript
• User browse to custom Node directory and select node.exe
• Tested after update Python & Node executable paths in settings update from old version to new version location and only when .updatePythonPath or .updateNodePath file exists.
• Selecting Python and Node exe from Settings window saves to settings class
• When Python and Node paths are selected from Environments folder EnsureLatestInstalled call will ensure the designated Python and Node installations are installed. This will also ensure that in the future when new version is define it will be installed on next start up.
• Custom Python and Node exe location outside of the Environments folder will not be affected by EnsureLatestInstalled call
• Old PythonEmbeddable directory should be removed if exists, and replaced with Python directory in the Environments folder.
• Running HelloWorld Node.js plugin.
• Running HelloWorld Python plugin.
• Plugins' file path is corrected after an app update or switching between potable and roaming mode.
• Plugins' file path is corrected after portable flow is moved to a different location.

Close #1157, #1344, #1035

[taooceros]

LOL why javascript extends from typescript

[jjw24]

Mainly so we don't need to reimplement anything since they both are using same everything. So plugin dev can set their plugin type as JavaScript or Typescript.