v9.0.0+tibiash.5: chore: release 9.0.0+tibiash.5 (#15)

• Store spell.effect, spell.spell_type, spell.group_spell, spell.level and spell.cooldown as NULL when a
  spell's article has no such field, and spell.cooldown as NULL when it is not a whole number of seconds, like
  1-2s, instead of dropping the spell. A spell with no mana field gets 0, which means special conditions apply.
  Force Strike, Broadcast, Poison Storm, Undead Legion, Sniper, Second Wind and Ultimate Explosion are now kept.
• Read a charm's three costs split by commas, like 800, 1200, 4000, when its cost field has no slash, instead of
  dropping the charm. Low Blow is now kept.
• Store npc.city as NULL when an NPC's article has no city field, instead of dropping the NPC. Such an NPC's
  travel legs start where a From [[Place]] note or a shuttle names, and otherwise have a NULL origin. A Blue Stone
  is now kept.
• Store achievement.name and achievement.description as NULL when an achievement's article has no such field,
  instead of dropping the achievement. achievement.description is now nullable. Achievement 563 is now kept.
• Add the mount.price_currency column. It holds the article's pricecurrency, otherwise Tournament Coins for a
  tournament mount, otherwise Tibia Coins, and NULL when the mount has no price. Landsailer's price of 140 is now
  in Event Points, not Tibia Coins.