Remove maddy submodule, replace it with own qsmaddy fork

.gitmodules

@@ -7,6 +7,6 @@
 [submodule "submodules/qssb.h"]
 	path = submodules/qssb.h
 	url = https://gitea.quitesimple.org/crtxcr/qssb.h.git
-[submodule "submodules/maddy"]
-	path = submodules/maddy
-	url = https://github.com/progsource/maddy
+[submodule "submodules/qsmaddy"]
+	path = submodules/qsmaddy
+	url = https://gitea.quitesimple.org/crtxcr/qsmaddy