add modparser module and update generate script

.gitmodules

@@ -4,3 +4,6 @@
 [submodule "json"]
 	path = json
 	url = git@github.com:bcumming/json.git
+[submodule "modparser"]
+	path = modparser
+	url = git@github.com:eth-cscs/modparser.git

mechanisms/generate.sh

 for mech in pas hh
 do
-    modcc -t cpu -o ../include/mechanisms/$mech.hpp ./mod/$mech.mod
+    ../modparser/bin/modcc -t cpu -o ../include/mechanisms/$mech.hpp ./mod/$mech.mod
 done

modparser @ d1dd8fa8

+Subproject commit d1dd8fa868c0dc7e348093ed4a4b5c6c94e29e34