table: add a simple text table renderer

This should help clean up some of the uglier status outputs.

Supports:

 * multi-line table cells
 * character fills
 * sparse tables
 * insert, delete by row and column
 * vertical separators

and not much else.

Signed-off-by: Zygo Blaxell <bees@furryterror.org>

test/Makefile

@@ -8,6 +8,7 @@ PROGRAMS = \
 	process \
 	progress \
 	seeker \
+	table \
 	task \
 
 all: test