fix issue 229 - float autoholds were not being cleared when closing a rom

BizHawk.Client.Common/inputAdapters/InputAdapters.cs

@@ -342,6 +342,7 @@ namespace BizHawk.Client.Common
 		public void ClearStickies()
 		{
 			stickySet.Clear();
+			_floatSet.Clear();
 		}
 
 		public void MassToggleStickyState(List<string> buttons)

BizHawk.Client.EmuHawk/MainForm.cs

@@ -3300,6 +3300,7 @@ namespace BizHawk.Client.EmuHawk
 				_stateSlots.Clear();
 				UpdateDumpIcon();
 				UpdateCoreStatusBarButton();
+				ClearHolds();
 				ToolHelpers.UpdateCheatRelatedTools(null, null);
 			}
 		}