Fix locations

[eevee]

They are confusing and messy everywhere. Fixplz.

Details are in my head and fluctuating, but LocationsUI contains some bits.

[eevee]

Added a class to wrap around location/Pokemon pairs and abstract away all the slot garbage in r388. Also changed the Pokemon page's location list to only show the "easiest" way to catch any given Pokemon.

Remaining:

• Diamond/Pearl differences.
• Detail page for a location/Pokemon pair with super-detail.
• Recreate location map.
• Fix up location pages to be similar but for individual Pokemon instead.
• Refactor database to have a table for sections too.
• Clean up this code a wee bit.
• Possibly fuzz the rarities.
• Change "[ru] x%; [sa] x%" to "[ru][sa] x%". For bonus points, "[rusa] x%".

[eevee]

Emergency weird crash fix in r390.

[eevee]

Blah blah stuff done in r393.

Remaining:

• Diamond/Pearl differences.
• Detail page for a location/Pokemon pair with super-detail.
• Recreate location map.
• Possibly fuzz the rarities, although I'm doubting I want to do this.

[eevee]

Map added by r394.

[eevee]

• Also need to do something better for Pokemon with no locations.
• Still need events!

[eevee]

Forgot db changes! r395.

[eevee]

AND r396.. :(

[eevee]

• Diamond/Pearl differences.
• Add EVs to location pages. If possible, find some way to give average EV per location per method.
• Detail page for a location/Pokemon pair with super-detail.
• Show something better for Pokemon with no locations.
• Event locations.