Advertise support for matrix as a URL scheme. (#4236)

Internally everything is already in place to handle Matrix URIs as we support them within the app.

ElementX/SupportingFiles/Info.plist

@@ -55,6 +55,7 @@
 			<key>CFBundleURLSchemes</key>
 			<array>
 				<string>$(BASE_BUNDLE_IDENTIFIER)</string>
+				<string>matrix</string>
 			</array>
 		</dict>
 	</array>

ElementX/SupportingFiles/target.yml

@@ -62,7 +62,8 @@ targets:
             CFBundleTypeRole: Editor,
             CFBundleURLName: "Application",
             CFBundleURLSchemes: [
-              $(BASE_BUNDLE_IDENTIFIER)
+              $(BASE_BUNDLE_IDENTIFIER), # The app's own scheme for custom routes
+              "matrix" # Matrix URI scheme for permalinks
             ]
           }
         ]