Add skeleton CountryRelationManager

Change `DiplomaticAction::Argument` to refer to `CountryInstance*` instead of `Country*`
Add `GameManager&` argument to `DiplomaticActionManager::setup_diplomatic_actions`
Add some ErrorMacros, likely and unlikely macros and stringization macros (based on Godot's macros)
Implement `increase_relations` DiplomaticAction commit function
Implement `decrease_relations` DiplomaticAction commit function
Fix include StringUtils.hpp errors

1 files changed, 2 insertions, 0 deletions

diff --git a/src/openvic-simulation/diplomacy/DiplomacyManager.hpp b/src/openvic-simulation/diplomacy/DiplomacyManager.hpp
index c71bdbf..7aca409 100644
--- a/src/openvic-simulation/diplomacy/DiplomacyManager.hpp
+++ b/src/openvic-simulation/diplomacy/DiplomacyManager.hpp
@@ -1,9 +1,11 @@
 #pragma once
 
+#include "openvic-simulation/diplomacy/CountryRelation.hpp"
 #include "openvic-simulation/diplomacy/DiplomaticAction.hpp"
 
 namespace OpenVic {
 	class DiplomacyManager {
 		DiplomaticActionManager PROPERTY_REF(diplomatic_action_manager);
+		CountryRelationManager PROPERTY_REF(country_relation_manager);
 	};
 }