added some zfishes to the json and to the GROUP_FISH
refined a bit the json
more refinement of the json, and will need even more later on i guess.
now to work on spawn code.
fixed freq of fish spawns, added more fish, moved fishfgroup to the
proper place.
Added the fishes to RIVER_GROUP
They should now spawn just like other river monsters..
They need to learn to only move inside water though..
typo fix
fixes on spawn chances and fishes
added zharks & (mutated) zalmons, removed zfish...
return nearby fish function added
1. added and refined zfish & their spawn chances
2. made the flag FISH useable (and declared it)
3. created the get_fishable function that returns the fish in a 60-wide area
4. made the fish trap code fish from the fishes around
fixes so that the whole thing up to now compiles and works as intended.
1) Reviewed fish & z-fish stats
2) Made fishing with rods work chatch from the spawned fish
3) Added a good rod, added code to handle it, added it to some spawn
lists in the item_groups
4) Made a catch_monster function that will choose a random monster from a list
to catch. Catched monsters die without leaving a message or corpse,
since the corpse in indipendently spawned and has started to rot
depending on fishing duration.
Seasonal Tiles

Support for seasonal tiles to be rendered depending on current season
WinterTest tileset

For testing purposes only. Do not merge tileset please.
1) fixed the mutant fishes to not be zombie species. also to not revive
and to give meat, not tainted meat.
2) the fish_basic function was renamed to fish_rod to better reflect its
use
3) the FISH flag was renamed to FISHABLE to prevent confusion
4) a vector of monster* type (named catchables) was added to items class. its currently
used only to store the initial fish (in the vincinity of a fish trap),
so that we can check every 30' if more fish have wandered in. This is
so, b/c the fish trap needs to have a chance to catch every fish that
has wandered close by while it is fishing.
5) an operator== overload was added to monster.h in order to be able to
find if two monsters in two different vectors are in fact the same
object.
6) The feature update fishing lists every 30' was implemented successfully.
7) Misc typos were also fixed
changed the flag fish to fishables in here too
Fix spacing in newchar
Small cosmetic comment fix
Monsters: only adjust triggers when the other monster has the same species.

Before this, every death of a monster with the MTRIG_FRIEND_DIED would change the moral/anger of *every* othe monster around.
The comment above that says it should only work for monsters of the same species through.
Don't list items in adv. inv. from squares where item can not be put on.