Changed icon for encoder error message box and fixed another minor inconsitency
Changed OSFileExists to use GetFileAttributes

Allows for proper detection of the availability of filenames containing
wildcard characters (for example on network shares)
Filter duplicate profile names

Works around the short names feature of FindFirstFile so foo.inibar is
not listed as an unloadable profile
Update NVENC.NoHardwareSupport message
Add ObsNvenc to repository
Integrate ObsNvenc into installer