This avoids any assumption from the driver, which would otherwise select
a specific platform and potentially mess up everything, resulting
usually in a display server failure.
* Replaces `find(...) != -1` with `contains` for `String`
* Replaces `find(...) == -1` with `!contains` for `String`
* Replaces `find(...) != -1` with `has` for containers
* Replaces `find(...) == -1` with `!has` for containers
I couldn't tell whether this has an actual purpose and it feels more
like a debug remnant.
We also need to be able to disable vsync in the editor for the WIP
Wayland backend (in the EGL driver) as it does manual frame throttling.
