Expose pixelgl.Window.SwapBuffers seperately from Window.Update

Allow buffers to be swapped without polling input, offering decoupling symmetrical with that provided by UpdateInput.

Revert "Fixed a couple of errors in methods comments"

Fixed a couple of errors in methods comments

Merge adding Rect.Intersects(Rect)bool function

fixed typo in comments.

Fixed error for forgeting to change benchark function from IsIntersect to Intersects.

This addes a new Rect.Intersects method which is around 5x faster then Rect.Intersect when used for basic collision checks.

Merge faiface/pixel version to Tskken/pixel

Start to maintain a change log

Adding AutoIconify and Floating GLFW window hints

Fix Go modules

Support for Modules.

Added ZR for zero rect

changed wording to match zero-vector returns in other functions.

Fixed doc refrince to R(0,0,0,0) in Rect.Intersect() to be a ZR and for it to return a ZR.

Also ran gofmt...