move apis into rom/modules/main for shell compatibility

core/apis/message.lua

@@ -1,4 +1,4 @@
-local Event = require('event')
+local Event = require('opus.event')
 
 local Message = { }
 
@@ -92,4 +92,4 @@ function Message.waitForMessage(msgType, timeout, fromId)
 	until e == 'timer' and side == timerId
 end
 
-return Message
+return Message