[WinForms] Add support for Delete key
[WinForms] Add support for Delete key

shivaprsdv/pywebview,r0x0r/pywebview,r0x0r/pywebview,r0x0r/pywebview,r0x0r/pywebview,shivaprsdv/pywebview,shivaprsdv/pywebview,shivaprsdv/pywebview,r0x0r/pywebview