WIP Factor out request, errors

errors/errors.go

@@ -0,0 +1,15 @@
+package common
+
+import (
+	"git.grassecon.net/urdt/ussd/internal/handlers"
+)
+
+var (
+	ErrInvalidRequest = handlers.ErrInvalidRequest
+	ErrSessionMissing = handlers.ErrSessionMissing
+	ErrInvalidInput = handlers.ErrInvalidInput
+	ErrStorage = handlers.ErrStorage
+	ErrEngineType = handlers.ErrEngineType
+	ErrEngineInit = handlers.ErrEngineInit
+	ErrEngineExec = handlers.ErrEngineExec
+)