Make Lua `savestate.*` functions return `false` when C# call throws

src/BizHawk.Client.Common/lua/CommonLibs/SaveStateLuaLibrary.cs

@@ -17,9 +17,18 @@ namespace BizHawk.Client.Common
 			}
 
 			_luaLibsImpl.IsUpdateSupressed = true;
-			var success = APIs.SaveState.Load(path, suppressOSD);
-			_luaLibsImpl.IsUpdateSupressed = false;
-			return success;
+			try
+			{
+				return APIs.SaveState.Load(path, suppressOSD);
+			}
+			catch
+			{
+				return false;
+			}
+			finally
+			{
+				_luaLibsImpl.IsUpdateSupressed = false;
+			}
 		}
 
 		[LuaMethodExample("savestate.loadslot( 7 );")]
@@ -32,33 +41,56 @@ namespace BizHawk.Client.Common
 			}
 
 			_luaLibsImpl.IsUpdateSupressed = true;
-			var success = APIs.SaveState.LoadSlot(slotNum, suppressOSD: suppressOSD);
-			_luaLibsImpl.IsUpdateSupressed = false;
-			return success;
+			try
+			{
+				return APIs.SaveState.LoadSlot(slotNum, suppressOSD: suppressOSD);
+			}
+			catch
+			{
+				return false;
+			}
+			finally
+			{
+				_luaLibsImpl.IsUpdateSupressed = false;
+			}
 		}
 
 		[LuaMethodExample("savestate.save( \"C:\\state.bin\" );")]
 		[LuaMethod("save", "Saves a state at the given path. If EmuHawk is deferring quicksaves, to TAStudio for example, that form will do what it likes (and the path is ignored).")]
-		public void Save(string path, bool suppressOSD = false)
+		public bool Save(string path, bool suppressOSD = false)
 		{
 			if (_luaLibsImpl.IsInInputOrMemoryCallback)
 			{
 				throw new InvalidOperationException("savestate.save() is not allowed during input/memory callbacks");
 			}
-
-			APIs.SaveState.Save(path, suppressOSD);
+			try
+			{
+				APIs.SaveState.Save(path, suppressOSD);
+				return true;
+			}
+			catch
+			{
+				return false;
+			}
 		}
 
 		[LuaMethodExample("savestate.saveslot( 7 );")]
 		[LuaMethod("saveslot", "Saves a state at the given save slot (must be an integer between 1 and 10). If EmuHawk is deferring quicksaves, to TAStudio for example, that form will do what it likes with the slot number.")]
-		public void SaveSlot(int slotNum, bool suppressOSD = false)
+		public bool SaveSlot(int slotNum, bool suppressOSD = false)
 		{
 			if (_luaLibsImpl.IsInInputOrMemoryCallback)
 			{
 				throw new InvalidOperationException("savestate.saveslot() is not allowed during input/memory callbacks");
 			}
-
-			APIs.SaveState.SaveSlot(slotNum, suppressOSD);
+			try
+			{
+				APIs.SaveState.SaveSlot(slotNum, suppressOSD);
+				return true;
+			}
+			catch
+			{
+				return false;
+			}
 		}
 	}
 }