Needed: Random encounter tables

[jonoxia]

Each domain can have its own random encounter table (though they can also share them).

Table can be keyed (optionally) on land type, day/night, and geographical rectangles.

Data inside the table is a series of d100 threshholds and encounters, maybe something like this: {50: {monster: biteWorm, number: 3}, 80: {monster: biteWorm, number: 5}, 98: {monster: groundSnake, number: 3}, 99: {monster: metalSlime, number: 1} }

where "50" as the key means "a d100 roll of 0-50 produces this encounter".

If keying on geographical rectangles, should be able to assign a zone code for each rectangle, and then key the encounter tables on zone codes. That way one zone can be built up from many rectangles, allowing irregular shapes.

[jonoxia]

Mostly done now, but we need a way to define multiple land tile numbers as a single terrain type for encounter purposes. Also need to allow a callback-based filter -- use this table if this function returns true