[client\_events.py] Use WinDLL/OleDLL instead of windll/oledll

[moi15moi]

See #735

[junkmd]

I pulled this change to my local environment and tested triggering Excel events. It seems to be working properly.

>>> from comtypes import client
>>> xl = client.CreateObject("Excel.Application") 
>>> xl.Visible = True
>>> client.PumpEvents(30)
>>> conn = client.ShowEvents(xl)
# event found: AppEvents_NewWorkbook
# event found: AppEvents_SheetSelectionChange
# event found: AppEvents_SheetBeforeDoubleClick
# event found: AppEvents_SheetBeforeRightClick
# event found: AppEvents_SheetActivate
# event found: AppEvents_SheetDeactivate
# event found: AppEvents_SheetCalculate
# event found: AppEvents_SheetChange
# event found: AppEvents_WorkbookOpen
# event found: AppEvents_WorkbookActivate
# event found: AppEvents_WorkbookDeactivate
# event found: AppEvents_WorkbookBeforeClose
# event found: AppEvents_WorkbookBeforeSave
# event found: AppEvents_WorkbookBeforePrint
# event found: AppEvents_WorkbookNewSheet
# event found: AppEvents_WorkbookAddinInstall
# event found: AppEvents_WorkbookAddinUninstall
# event found: AppEvents_WindowResize
# event found: AppEvents_WindowActivate
# event found: AppEvents_WindowDeactivate
# event found: AppEvents_SheetFollowHyperlink
# event found: AppEvents_SheetPivotTableUpdate
# event found: AppEvents_WorkbookPivotTableCloseConnection
# event found: AppEvents_WorkbookPivotTableOpenConnection
# event found: AppEvents_WorkbookSync
# event found: AppEvents_WorkbookBeforeXmlImport
# event found: AppEvents_WorkbookAfterXmlImport
# event found: AppEvents_WorkbookBeforeXmlExport
# event found: AppEvents_WorkbookAfterXmlExport
# event found: AppEvents_WorkbookRowsetComplete
# event found: AppEvents_AfterCalculate
# event found: AppEvents_SheetPivotTableAfterValueChange
# event found: AppEvents_SheetPivotTableBeforeAllocateChanges
# event found: AppEvents_SheetPivotTableBeforeCommitChanges
# event found: AppEvents_SheetPivotTableBeforeDiscardChanges
# event found: AppEvents_ProtectedViewWindowOpen
# event found: AppEvents_ProtectedViewWindowBeforeEdit
# event found: AppEvents_ProtectedViewWindowBeforeClose
# event found: AppEvents_ProtectedViewWindowResize
# event found: AppEvents_ProtectedViewWindowActivate
# event found: AppEvents_ProtectedViewWindowDeactivate
# event found: AppEvents_WorkbookAfterSave
# event found: AppEvents_WorkbookNewChart
# event found: AppEvents_SheetLensGalleryRenderComplete
# event found: AppEvents_SheetTableUpdate
# event found: AppEvents_WorkbookModelChange
# event found: AppEvents_SheetBeforeDelete
# event found: AppEvents_WorkbookBeforeRemoteChange
# event found: AppEvents_WorkbookAfterRemoteChange
# event found: AppEvents_RemoteSheetChange
# event found: AppEvents_RemoteWorkbookNewSheet
# event found: AppEvents_RemoteWorkbookNewChart
# event found: AppEvents_RemoteSheetBeforeDelete
# event found: AppEvents_RemoteSheetPivotTableUpdate
>>> client.PumpEvents(10)
Event AppEvents_WindowResize(None, <POINTER(_Workbook) ptr=0x26e782cd528 at 26e791483d0>, <POINTER(Window) ptr=0x26e782cd838 at 26e791482d0>)
Event AppEvents_SheetSelectionChange(None, <POINTER(_Worksheet) ptr=0x26e77f831b8 at 26e791485d0>, <POINTER(Range) ptr=0x26e77f83bc8 at 26e791481d0>)
Event AppEvents_SheetSelectionChange(None, <POINTER(_Worksheet) ptr=0x26e764aa8c8 at 26e791484d0>, <POINTER(Range) ptr=0x26e764aa548 at 26e791482d0>)
Event AppEvents_NewWorkbook(None, <POINTER(_Workbook) ptr=0x26e78233bb8 at 26e79148450>)
Event AppEvents_WindowDeactivate(None, <POINTER(_Workbook) ptr=0x26e764aa938 at 26e791483d0>, <POINTER(Window) ptr=0x26e764aa4d8 at 26e791485d0>)
Event AppEvents_WorkbookDeactivate(None, <POINTER(_Workbook) ptr=0x26e782345c8 at 26e79148650>)
Event AppEvents_WorkbookActivate(None, <POINTER(_Workbook) ptr=0x26e764aa158 at 26e791484d0>)
Event AppEvents_WindowActivate(None, <POINTER(_Workbook) ptr=0x26e78233ec8 at 26e79148150>, <POINTER(Window) ptr=0x26e78234788 at 26e791483d0>)

[junkmd]

Thanks!