yabause: Upgrade to 0.9.15

Switch from qt4 to qt5.

CHANGELOG
=========
Yabause 0.9.15

August 24, 2016 - guillaume.duhamel - Release

Following our strict release schedule, here's a new Yabause version.
This new version includes so many new stuff, I cannot list them all.
(If you really want the full list, it's on our repository)

Arguably, the most notable features of this release are:

- Low-level CD Block emulation
- CloneCD file format support
- High resolution for the software renderer

We also included code from other great projects:

- Musashi 68K core (code by Karl Stenerud)
- SSF sound format playing (code by R. Belmont, Richard Bannister, Neil Corlett)

As many of you should already be aware, Yabause was forked into a new project,
uoYabause, by devmiyax. We included some of his fixes back into Yabause.

Due to lack of maintainer, this release will be the last to include a gtk port.

Since our last release, we also improved our tools:

- Automated builds for linux, mac and windows
- Development builds pushed after each commit
- Translations on Transifex
- Compatibility reports on our wiki

And finally, we had to move from Paypal to Patreon

(kamil)