* Expose `DefaultApplicationMenu`.
Add `FindByLabel` and `ItemAt` for finding menu items in a menu
* Add `Menu.RemoveMenuItem()`, `MneuItem.GetAccelerator()` and `MenuItem.RemoveAccelerator()`
* Remove `Update`
* Iterate when removing menu items
* Add `GetSubmenu()`
This update adds implementation to several menu item functions, replacing their previous 'not implemented' state. This includes actions for close, reload, forcing reload, toggling of fullscreen, reset zoom, and others. The update also includes modifications for the handling of developer tools toggle under different build configurations. This refactoring is aimed to standardize devtools configuration across different operating systems.
This update allows the application shutdown to be cancelled. It implements the shouldQuit function, which can prevent the application from quitting if it returns false. Additional checks have been added to ensure cleanup and quit processes are performed only if required. The darwin delegate and linux and windows applications were modified to include this new functionality.
