* Design and partial implementation for styled text renderer 4.x-dev

* Export wave 4.x-dev

* Bitmap export 4.x-dev

* JPEG export 4.x-dev

* Mouse movement messages no longer generated when cursor is not over the window 4.x-dev

* Spacing for trimmed fonts is now adjusted heuristically 4.x-dev

* Audio now joins its thread 4.x-dev

* PNG export can now export alpha only images as grayscale_alpha 4.x-dev

* Atlas spacing to avoid bleeding 4.x-dev

* Bitmap create atlas 4.x-dev

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