* Wrap the display globals in a struct
Makes it easier to search/replace these, for future refactorings.
* Some renaming
* Qt buildfix, also fix the Qt build on Mac (got broken with battery changes)
* Attempt at buildfixing ios
* UWP buildfix
* Remove unmotivated check preventing texture ini creation on mobile.
Fixes#15644
* Show a "toast" message on platforms that don't support opening a text editor, when you try to create/open a texture ini file.
* Avoid the need to ifdef around calls to SystemToast
* UWP buildfix (and some warning fixes).
And possibly libretro fix
* Rename for a bit more consistency
Still left some ifdefs because of System_InputBoxGetString(), but
hopefully we can move away from them. Some devices (like SDL) may only
optionally have a keyboard, so it's a runtime check.
This will disappear in future Android versions but can be useful for
older devices.
Fixes (or at least tries to) #10199, at least for some devices.
Might help #13827 ?
Tested on Pocophone F1.
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