Setup AppVeyor Build Using MSVC 2017 & Releases (#28)
* Change target name to "RadialGM.exe" for qmake build
* Support ICO/GIF/JPEG in CMake build
* Link Windows Vista and Uxtheme in CMake build
* Add a normal rc resource file to set the exe icon in the CMake build
* Link `version` instead of `Mincore` so we can support pre-Windows 8 operating systems
* Point enigma-dev submodule at newer master branch tip with GMK fix
* Build and deploy RadialGM releases for Win32 using static depencies from RadialGM-deps repo
* Add AppVeyor status badge to README.md
