move flags to its own module.

proto/character.proto

@@ -5,6 +5,8 @@ service CharacterManager {
 	rpc getCharacter(GetCharacterRequest) returns (Character);
 }
 
+message Empty {}
+
 message Character {
 	string PlayerName = 1;
 	string CharacterName = 2;
@@ -15,4 +17,6 @@ message CreateCharacterRequest {
 	Character characterData = 1;
 }
 
-message GetCharacterRequest {}
+message GetCharacterRequest {
+	Empty empty = 1;
+}