nds4droid release 6

Another day, another nds4droid release. You know the drill! Sourceforge or Google Play. The changes this time:

• Better multi-threading model for screen compositing. Games should feel smoother and devices with multiple cores should now be able to use screen filters with little performance cost.
• The “touch” mode button should now behave better.
• Fixed a bug where presses on the DS touch screen only registered their initial press.
• Disabled some rarely used graphical effects in the software renderer for better performance.

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