Review and add CatroModulo at version 0.6.4. #549

.gitmodules

@@ -315,3 +315,6 @@
 [submodule "repos/Starling_Via"]
 	path = repos/Starling_Via
 	url = https://github.com/starlingcode/Via-for-Rack.git
+[submodule "repos/CatroModulo"]
+	path = repos/CatroModulo
+	url = https://github.com/catronomix/catro-modulo.git

manifests/CatroModulo.json

@@ -0,0 +1,9 @@
+{
+  "name": "Catro Modulo",
+  "author": "catronomix",
+  "license": "BSD-3-Clause",
+  "repoVersion": "0.6.4",
+  "manualUrl": "https://github.com/catronomix/catro-modulo/blob/master/CM-manual-v0.6.4.pdf",
+  "sourceUrl": "https://github.com/catronomix/catro-modulo.git",
+  "pluginUrl": "https://github.com/catronomix/catro-modulo/blob/master/README.md"
+}

repos/CatroModulo

@@ -0,0 +1 @@
+Subproject commit f4b130717f0683204b85266f2e1843a02f1a8c0b