moving run command

- run command is no longer attached to the 'command' subcmd
- run is standalone

constants/error.go

@@ -0,0 +1,8 @@
+package constants
+
+const (
+	//sqlite doesn't have an error type for this error, but we want to catch when this error is thrown
+	//and provide the proper response. It should not be treated as an error if the db isn't setup.
+	ErrInit    = "sqlite3: SQL logic error: no such table: commands"
+	ErrInitRsp = "The 'init' command must be run before mctl can be used"
+)