Multiple flycams is not supported

[mahulst]

I'm using a second camera for some debug lines, and it uses RenderLayers to be always on top.
In the player_look system you iterate over camera's and in the loop you iterate over the events.
After the events are read in the first iteration, the second iteration will yield no new events.

Swapping the camera loop with the event loop fixes the issue.
Would you be open to a PR?