feat(colitur-x): fill the window instead of a fixed grid

Cell size is now computed from the window -- width divided seven ways,
height six -- and the number of lines a feast name gets is whatever fits
the resulting cell. config.h holds minimums rather than sizes.

Under a tiling window manager the calendar now uses its whole tile. It
previously drew a fixed 196x116 grid and left the rest of the tile black,
which is what every screenshot of it has shown.

The size hint is now PREFERRED plus MINIMUM, never fixed. Pinning it
fought the WM, which ignored it anyway, and stopped the grid using a
larger tile.

Added -g WxH, the same flag st takes, mainly because it makes the reflow
testable: verified at 1365x687 (two name lines) and 1852x1024 (three).

1 files changed, 0 insertions, 0 deletions

diff --git a/colitur-x b/colitur-x
index 0865757..5e01f04 100755
--- a/colitur-x
+++ b/colitur-x