Show the permission dialog the first time host or connect is clicked.

While the permission is not granted, show an info box at the bottom of the netplay setup screen explaining the need for the permission with a button to grant permission. Launch the app settings menu where the permission can be granted manually if the user has denied twice previously preventing us from showing the permission dialog.

Workarounds using the shouldShowRationale flag and detecting if the dialog showed via onPause to account for well known limitations in the android permissions API.

These API levels don't allow color selectors to be used as backgrounds.

Switch to MaterialDivider and set the color via dividerColor instead of background.

Android: Netplay controller mapping

- Switch from ActivityResultContracts.GetContent() to OpenDocument()
  which restores ACTION_OPEN_DOCUMENT behavior, granting write access
  to file descriptors opened in C++ via ContentHandler.openFd().
- Replace unsafe force-unwraps (!!) in EmulationActivity with null checks.

UI for assigning netplay players to gamecube ports and wii remotes.

Android: Add global settings search

Using dual core during netplay seems sufficiently detrimental that its worth showing this warning message and the option to turn dual core off when starting netplay.

To make it extra clear that this is measuring the XFB, not the EFB.