Fixes for consistent appearance of the Console across targets (color, co...

...rners, etc.)

Using `curveTo()` as a replacement for `drawRoundRectComplex()` on non-flash.
Now it should look somewhat consistent (blendmodes aside) across targets. For smaller window sizes the text and bars should also shrink.

Beware that the background color must be defined in project.xml to work on (cpp | neko) by now.

Tested with this: https://github.com/azrafe7/HaxePunk-minitests/tree/master/TestRoundedConsole

Again... please test it further.

EDIT: I've run it on flash, cpp and neko on Win 7, not sure about other platforms/targets (html5 seems a no go! o.O).