FIX(installer): Re-add URL protocol registration registry keys on ins…

…tall

In the installer refactor (88e1786) these registry keys were removed, so new installs did not register a URL protocol and users weren't able to use `mumble://` links.
This is a translation of the registry values from `Files.wxs` to equivalent WixSharp code.

Closes mumble-voip#5473

installer/ClientInstaller.cs

@@ -155,7 +155,7 @@ public ClientInstaller(string version, string arch, Features features) {
 
 		for (int i = 0; i < binaries.Count; i++) {
 			if (binaries[i] == "mumble.exe") {
-				binaryFiles[i] = new File(@"..\..\" + binaries[i], new FileAssociation("mumble_plugin", "application/mumble", "Open", "\"%1\""));
+				binaryFiles[i] = new File(new Id("mumble.exe"), @"..\..\" + binaries[i], new FileAssociation("mumble_plugin", "application/mumble", "Open", "\"%1\""));
 			} else {
 				binaryFiles[i] = new File(@"..\..\" + binaries[i]);
 			}
@@ -183,6 +183,12 @@ public ClientInstaller(string version, string arch, Features features) {
 			menuDir,
 			desktopDir
 		};
+		this.RegValues = new RegValue[] {
+			new RegValue(RegistryHive.ClassesRoot, "mumble", "", "URL:Mumble"),
+			new RegValue(RegistryHive.ClassesRoot, "mumble", "URL Protocol", ""),
+			new RegValue(RegistryHive.ClassesRoot, @"mumble\DefaultIcon", "", "[#mumble.exe]"),
+			new RegValue(RegistryHive.ClassesRoot, @"mumble\shell\open\command", "", "[#mumble.exe] \"%1\"")
+		};
 	}
 }