Function for setting font?

BLT has terminal_color for setting the current color, terminal_layer for the layer, etc etc, but the only way to set the font that I can tell is to use print with a font tag in the string. Would it be possible to have a terminal_font function to set the default font? Sometimes it would be useful to separate the font-choosing code from the actual printing/drawing code.

Another option is a variant of put_ext that takes a nullable font name.

Add font() function (select the current font by name, closes issue #33).

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