mechanic: move word lists to data files

The word lists (monsters, spells, equipment, races, classes, titles and
so on) now live in pqcli/data/*.json instead of pqcli/config.py. A
GameData object loaded at startup is passed to the simulation and UIs.

Users can replace any list by putting NAME.json in
$XDG_CONFIG_HOME/pqcli/data/ or a directory given with --data-dir.
--dump-data DIR copies the built-in files out for editing. Malformed
files are reported and pqcli exits before starting the UI.

Combat task descriptions come from the new combat_verbs list, with
{target} standing for the enemy. The built-in list holds only "Executing
{target}", and a single verb consumes no random roll, so stock gameplay
is unchanged. Recorded traces in tests/fixtures pin this down.

Monster, Race and Class stay in pqcli.config so existing saves still
load.

Resolves #3

pqcli/data/spells.json

@@ -0,0 +1,49 @@
+[
+  "Slime Finger",
+  "Rabbit Punch",
+  "Hastiness",
+  "Good Move",
+  "Sadness",
+  "Seasick",
+  "Shoelaces",
+  "Inoculate",
+  "Cone of Annoyance",
+  "Magnetic Orb",
+  "Invisible Hands",
+  "Revolting Cloud",
+  "Aqueous Humor",
+  "Spectral Miasma",
+  "Clever Fellow",
+  "Lockjaw",
+  "History Lesson",
+  "Hydrophobia",
+  "Big Sister",
+  "Cone of Paste",
+  "Mulligan",
+  "Nestor's Bright Idea",
+  "Holy Batpole",
+  "Tumor (Benign)",
+  "Braingate",
+  "Summon a Bitch",
+  "Nonplus",
+  "Animate Nightstand",
+  "Eye of the Troglodyte",
+  "Curse Name",
+  "Dropsy",
+  "Vitreous Humor",
+  "Roger's Grand Illusion",
+  "Covet",
+  "Black Idaho",
+  "Astral Miasma",
+  "Spectral Oyster",
+  "Acrid Hands",
+  "Angioplasty",
+  "Grognor's Big Day Off",
+  "Tumor (Malignant)",
+  "Animate Tunic",
+  "Ursine Armor",
+  "Holy Roller",
+  "Tonsillectomy",
+  "Curse Family",
+  "Infinite Confusion"
+]