kernel: cons: Optimize console drawing

Prevents the cursor from being cleared right before a character is drawn
or right after the screen is cleared. Also optimized the cursor drawing
routine to just draw a rectangle instead of rendering a space character.
Additionally renamed `cons_render_char()` to `cons_draw_char()` and
fixed all characters being drawn one pixel too far to the right.

Signed-off-by: Quinn Stephens <quinn@osmora.org>
Signed-off-by: Ian Moffett <ian@osmora.org>

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