Enhanced Windows wrapper script

[Varstahl]

I added a bit of functionality to the apktool wrapper script and thought I'd share. This has several advantages compared to the base currently available:

1. No environment pollution
2. Automatic pick of the latest version, without the need to rename
3. Supports command-less calls, if the only parameter is a directory or an apk
   • Supports drag & drop
   • Supports double-click
   • Supports "Send to" functionality
4. Pauses when ran non interactively, so the prompt doesn't automatically close

If the script finds an apktool.jar it's selected automatically, otherwise it looks for jar versions available in its directory with the name format apktool_<version>.jar and picks the latest accordingly.

With drag & drop, send-tos and calls:

• if the parameter is an apk file, the script issues the d command
• if the parameter is a directory, the script issues the b command

[iBotPeaches]

Thanks for the PR! Going to give this a spin on windows and do a little-QA and then merge it.

[iBotPeaches]

Worked out great in testing. Rebased and waiting on tests and will get this merged.