Thread timeout settable, keyboard, mouse detection info

[jvcleave]

ofAppEGLWindow calls waitForThread which by default has an infinite timeout. This can causes certain apps to hang indefinitely. This gives the user an option to set the timeout

This also adds 2 methods hasMouse() and hasKeyboard() so an app can tell whether a mouse/keyboard have been detected. This can be useful in writing examples for different configurations
i.e

ofAppEGLWindow *appEGLWindow = (ofAppEGLWindow *) ofGetWindowPtr();
if(appEGLWindow->hasMouse()) x = mouseX;

[arturoc]

the setThreadTimeOut method seems a little weird, you need to know details about the destructor implementation to know what's going on. do we need to join the thread at all?

[jvcleave]

@arturoc yeah - I agree it is weird. I was mostly trying to avoid adding back in the hardcoded 10 seconds that we just removed from ofThread. I can try removing it and test as well.

@bakercp - any thoughts on removing waitForThread from here?
https://github.com/openframeworks/openFrameworks/blob/master/libs/openFrameworks/app/ofAppEGLWindow.cpp#L814