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/item_ofs.json

@@ -0,0 +1,54 @@
+[
+  "Foreboding",
+  "Foreshadowing",
+  "Nervousness",
+  "Happiness",
+  "Torpor",
+  "Danger",
+  "Craft",
+  "Silence",
+  "Invisibility",
+  "Rapidity",
+  "Pleasure",
+  "Practicality",
+  "Hurting",
+  "Joy",
+  "Petulance",
+  "Intrusion",
+  "Chaos",
+  "Suffering",
+  "Extroversion",
+  "Frenzy",
+  "Sisu",
+  "Solitude",
+  "Punctuality",
+  "Efficiency",
+  "Comfort",
+  "Patience",
+  "Internment",
+  "Incarceration",
+  "Misapprehension",
+  "Loyalty",
+  "Envy",
+  "Acrimony",
+  "Worry",
+  "Fear",
+  "Awe",
+  "Guile",
+  "Prurience",
+  "Fortune",
+  "Perspicacity",
+  "Domination",
+  "Submission",
+  "Fealty",
+  "Hunger",
+  "Despair",
+  "Cruelty",
+  "Grob",
+  "Dignard",
+  "Ra",
+  "the Bone",
+  "Diamonique",
+  "Electrum",
+  "Hydragyrum"
+]