[v3] Added basic encoding options and an icon

Closes #1 (finally), closes #9

Further changes in this release:
- Added the ability to use extra command line parameters (closes #14)
- Added a .NET Framework version check to avoid crashes without an error
message (closes #12)
- The program now does not check for updates straight after an upgrade
(closes #13)
- Inlining optimizations

The icon was made by tns301.