PPSSPP 1.5 - Vulkan support, and more

[Henrik]

Here we go!

Doing a slow rollout on Google Play this time, there will be a followup release shortly.

What's new in 1.5.0
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* Full Vulkan support, also for Android now. Very fast on supported devices. (#10033, #10049)
* Smarter graphics state management, reduced CPU consumption on all backends (#9899)
* Android: Support for Arabic and other scripts we couldn't support before
* Fix Android widgets, screen scaling (#10145)
* Fixes to video dumping
* Geometry problems fixed in Medal of Honor
* Implement immediate draws, fixing Thrillville (#7459)
* Software rendering improvements, speed and accuracy
* Hardware tesselation of PSP Beziers and Splines (used by a few games)
* Partial sceUsbGps and sceUsbCam support (Android)
* Android "Sustained performance mode" to avoid thermal throttling (#9901)
* Linux controller mapping fixes (#9997)
* Assorted bugfixes and compatibility improvements