Refactored Self Delete Method

[MrDevBot]

Currently the method works by writing a .batch script to disk, this method isn't very efficient and can be achieved by passing commands to CMD's startup parameters (/c) and a delay of 5 seconds (/t 5). We also don't have to worry about leaving a .bat script on the disk after the client is uninstalled

[alphaO4]

Also the old method left a .bat with the name Delete or something like that, so the new method really looks promising.