Introduced the ability to clone a menu, along with its submenus, in Linux-based web applications to create a full deep copy. This fixes reusing the application menu for window menus.
The commit introduces a set of webview GPU policies to control hardware acceleration. These policies define when hardware acceleration is enabled on the webview. An option for this has been added to the LinuxWindow struct for Linux specific windows. Additional code modification was carried out to use this new GPU policy option when calling `windowNew` function. Finally, the sequence of the GPU Policies in the const declaration has been updated for better readability.
This commit includes the addition of common events for the Linux platform. Refactored and standardized the method receivers for the application from 'm' to 'l'. Also, the application startup events in the window example have been updated according to the new naming scheme.
- use unsafe.Pointers for 'signal_connect'
- add handler for 'script-message-received::external'
need to update this to handle older versions of webkit2gtk better
currently removed the ifdef guards (since they don't work in Go code
directly) - need to reimplement using build tags if required.
- drop the gtkSignalHandlers map entirely (wasn't used)
- use 'uint' for mapping signal IDs to MenuItem
- store and retrieve the menuitem identifier to/from the menu item widget
Linux requires a `gtk_menu_bar` for a gtk_window to display a menu.
For the `systray` a `gtk_menu` is needed instead.
This change creates the correct type of `impl` for the `Menu`
depending on how it is being used.
