feat(mako): api deps generation works

It's very pleasant to use, and worth the slightly greater effort.

src/mako/deps.mako

@@ -0,0 +1,24 @@
+<%api_info=[]%>
+% for a in api.list:
+<%
+	gen_root = directories.output + '/' + a.name + '_' + a.version
+	api_name = a.name + a.version
+	api_clean = api_name + '-clean'
+	api_info.append((api_name, api_clean, gen_root))
+%>
+${gen_root}: ${directories.api_base}/${a.name}/${a.version}/${a.name}-api.json ${SHARED_INFO_FILE}
+${api_name}: ${gen_root}
+	@echo TODO ${api_name} command
+${api_clean}:
+	-rm -Rf ${gen_root}
+% endfor
+
+.PHONY += $(.PHONY) ${' '.join(a[0] for a in api_info)} ${' '.join(a[1] for a in api_info)}
+
+help-api:
+% for a in api_info:
+	$(info ${a[0]}    -    build the ${a[0]} api)
+	$(info ${a[1]}    -    clean all generated files of the ${a[0]} api)
+% endfor
+
+clean-api: ${' '.join(a[1] for a in api_info)}