Removal of chrono and async_trait as dependancy in db-lib

Removig chrono from api code as well

Removing chrono as dep in api code
+ Using Content-Type for /message/send content type

Updating cargo lists for removal of fluff deps

Removal of more fluff

Addking makefile to avoid compiling debug builds by accident while developing

json-api/Makefile

@@ -0,0 +1,8 @@
+default:
+	cargo build --release
+
+dep:
+	cargo update
+
+clean:
+	cargo clean