Added Entity::RemoveFromGroup for Just Alex :)

Author: garethyr

CHANGELOG.md

@@ -250,6 +250,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 - New `SoundContainer` INI and Lua (R/W) property `PitchVariation`, which can be used to randomize the pitch of the sounds being played.
 
+- Added `Entity` Lua function `entity:RemoveFromGroup(groupToRemoveFrom)` which removes the given group from the `Entity`. The reverse of `AddToGroup`.
+
 </details>
 
 <details><summary><b>Changed</b></summary>

Lua/LuaBindingsEntities.cpp

@@ -22,6 +22,7 @@ namespace RTE {
 		.def("Reset", &Entity::Reset)
 		.def("GetModuleAndPresetName", &Entity::GetModuleAndPresetName)
 		.def("AddToGroup", &Entity::AddToGroup)
+		.def("RemoveFromGroup", &Entity::RemoveFromGroup)
 		.def("IsInGroup", &Entity::IsInGroup);
 	}
 

System/Entity.h

@@ -382,7 +382,13 @@ namespace RTE {
 		/// Adds this Entity to a new grouping.
 		/// </summary>
 		/// <param name="newGroup">A string which describes the group to add this to. Duplicates will be ignored.</param>
-		void AddToGroup(std::string newGroup) { m_Groups.push_back(newGroup); m_Groups.sort(); m_Groups.unique(); m_LastGroupSearch.clear(); }
+		void AddToGroup(const std::string &newGroup) { m_Groups.push_back(newGroup); m_Groups.sort(); m_Groups.unique(); m_LastGroupSearch.clear(); }
+
+		/// <summary>
+		/// Removes this Entity from the specified grouping.
+		/// </summary>
+		/// <param name="groupToRemoveFrom">A string which describes the group to remove this from.</param>
+		void RemoveFromGroup(const std::string &groupToRemoveFrom) { m_Groups.remove(groupToRemoveFrom); m_LastGroupSearch.clear(); }
 
 		/// <summary>
 		/// Returns random weight used in PresetMan::GetRandomBuyableOfGroupFromTech.