GetMimeTypeFromContent.cs: source comments
GetMimeTypeFromContent.cs: resharper cleanup

GetMimeTypeFromExtension.cs: source comments
QuakePakFile.cs: source comments
QuakePakFileSystem.cs: source comments
INIFile.cs: source comments
PortableSettingsProvider.cs: source comments
PortableSettingsProvider.cs: resharper cleanups
MultimaskFileSearcher.cs: source comments
StreamHandling.cs: source comments