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

tests/game_trace.py

@@ -0,0 +1,69 @@
+import datetime
+import typing as T
+
+from pqcli import random
+from pqcli.config import StatType
+from pqcli.game_data import load_game_data
+from pqcli.mechanic import Player, Simulation, Stats, monster_task
+
+STATS = {
+    StatType.strength: 12,
+    StatType.condition: 11,
+    StatType.dexterity: 10,
+    StatType.intelligence: 13,
+    StatType.wisdom: 14,
+    StatType.charisma: 9,
+    StatType.hp_max: 6,
+    StatType.mp_max: 5,
+}
+
+
+def run_trace(seed: str, ticks: int = 3000) -> T.List[str]:
+    """Play a deterministic game and return everything that happened."""
+    data = load_game_data()
+    player = Player(
+        name="Tester",
+        birthday=datetime.datetime(2000, 1, 1),
+        race=data.races[0],
+        class_=data.classes[0],
+        stats=Stats(dict(STATS)),
+    )
+    random.seed(seed)
+    simulation = Simulation(player, data)
+
+    lines: T.List[str] = []
+    player.connect(
+        "new_task",
+        lambda: lines.append(f"task: {player.task.description}"),
+    )
+    for _ in range(ticks):
+        simulation.tick(100000.0)
+
+    # plot cinematics and quests are rare in a short run, so force them
+    for _ in range(30):
+        simulation.interplot_cinematic()
+        simulation.complete_quest()
+    lines.extend(f"queued: {task.description}" for task in player.queue)
+    player.queue.clear()
+
+    # high level monsters are unreachable in a short run
+    for level in range(1, 100):
+        task = monster_task(data, level, player.quest_book.monster)
+        lines.append(f"monster: {task.description} {task.duration}")
+
+    lines.append(f"level: {player.level}")
+    lines.append(f"act: {player.quest_book.act}")
+    lines.append(f"gold: {player.inventory.gold}")
+    for stat, value in player.stats:
+        lines.append(f"stat: {stat.value} {value}")
+    for equipment_type, item in player.equipment:
+        lines.append(f"equipment: {equipment_type.value} {item}")
+    for inventory_item in player.inventory:
+        lines.append(
+            f"inventory: {inventory_item.name} {inventory_item.quantity}"
+        )
+    for spell in player.spell_book:
+        lines.append(f"spell: {spell.name} {spell.level}")
+    for quest in player.quest_book.quests:
+        lines.append(f"quest: {quest}")
+    return lines