Add more ways to disable and clean Defender #74

Adds more scripts to:
 - disable Windows Defender functions,
 - remove it from the user interface,
 - clean its scan history.

Improves the documentation:
 - Adds more documentation reference URLs.
 - Restructures scripts in a way to better document their behavior. All
   Defender scripts are now under "Disable Windows Defender" and
   "Privacy over security".

Changes recommendations, and simply recommends less:
 - Defender cloud configurations are now only documented on "Strict"
   mode.
 - Watson event sending with "DisableGenericReports" is disabled due to
   lack of documentation and depreciation.