BHoM_Adapter: update&correct Toolkit template

[alelom]

Once the refactoring (#84) is done, update the Visual Studio Template for the generation of the Toolkits code.

This should also include a correction of the previous behaviour that moved some files in the wrong folder, as illustrated in the wiki itself.

• 1) Update to latest refactored adapter structure
• 2) Correct/expand/improve the comments
• 3) Update/improve the Engine Method Templates

2) Correct/expand/improve the comments

Tips I would've found useful:

• Above the adapter constructor, specify that any parameter added will be reflected automatically in the parameters of the GH/Dyn/Excel component.

Corrections I would find useful:

• Having distinct comment "regions" for Private methods and Private fields is not correct by definition (fields include the methods). Rename Private fields to Private variables.
• The comment region Public Fields seems to appear twice.
• I would delete the Public Fields naming and replace it with two: Public Properties and Public Methods (Push, Pull, and any other public method).

Additional notes

Closes https://github.com/BuroHappoldEngineering/BHoM_Documentation/issues/32