windows: updated uninstaller to remove community vm

[sthak004]

Notes:

• All uninstaller related files are now placed into a uninstall folder to decrease clutteredness.
• I renamed the original file called virtualbox_vagrant_uninstaller.bat to uninstaller.bat as it is the main uninstall script to remove all necessary components. This, in turn, should help improve clarity. Please run this script as a means of testing the uninstaller as a whole.
• The new file vm_destroyer.bat is a component that will help destroy the community VM and all associated folders/files. It will do this regardless of which state the virtual machine is in whether it be
  1. running
  2. poweroff
  3. not running (i.e. no community vm initialized)

WARNING: Sometimes my machine restarted after uninstalling vagrant, so please save whatever you are working on before running the script as a step of precaution. This is a bug that I am running trying to fix.

[dogi]

awesome it looks good, but still have to test it anyhow will for now accept this pull request and test later ...