Allow changing inventory_items_animations from the main menu

If you try and change the setting from in-game you'll have to log out 
and back in for it to update.

src/client/client.cpp

@@ -135,6 +135,7 @@ Client::Client(
 	m_cache_save_interval = g_settings->getU16("server_map_save_interval");
 	m_round_screen = g_settings->getU16("round_screen");
 	m_hud_scaling = g_settings->getFloat("hud_scaling");
+	m_inv_item_anim_enabled = g_settings->getBool("inventory_items_animations");
 }
 
 void Client::loadMods()

src/client/client.h

@@ -430,6 +430,7 @@ public:
 
 	const u16 getRoundScreen() { return m_round_screen; }
 	const f32 getHudScaling() { return m_hud_scaling; }
+	const bool getInvItemAnimEnabled() { return m_inv_item_anim_enabled; }
 private:
 	void loadMods();
 
@@ -593,4 +594,5 @@ private:
 
 	u16 m_round_screen;
 	f32 m_hud_scaling;
+	bool m_inv_item_anim_enabled;
 };

src/client/hud.cpp

@@ -948,8 +948,7 @@ void drawItemStack(
 		return;
 	}
 
-	const static thread_local bool enable_animations =
-		g_settings->getBool("inventory_items_animations");
+	const bool enable_animations = client->getInvItemAnimEnabled();
 
 	const ItemDefinition &def = item.getDefinition(client->idef());