The current bottleneck is 'put_glyph_rgba4444'. Interpolate mode
enables us to remove the conditional in the inner loop.
Eventually this call should just reduce to a memcpy.
The interpolate mode is more suited for font rendering, even
if it produces slightly different results.
The main reason for switching is to avoid some conditionals
in the coming code improvements.
It would just segfault after a while, since we weren't deferencing
the 'msg' pointer to check for the end of the string.
Eventually this would let 'msg' point to invalid memory.
The crtc should be disabled before deallocating the buffers, otherwise
leading to a use-after-free scenario, which can trigger all sorts
of funny effects.
