test/vis: convert vis specific tests to use the Lua API

Instead of using the keys utility to convert the textual key representation
into something a terminal would send and then pipe it to vis' standard input
use the Lua API to directly feed the keys into vis' input queue.

This has a number of advantages:

 - it is less fragile: the keys utility is incomplete and only handles the
   most common keys

 - it is faster because there is no need to artificially delay input
   after an <Escape> key to give vis a chance to distinguish between
   a single <Escape> and the start of an escape sequence

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