world: implement Manager::isRaining (#214)

* world: implement Manager::isRaining

Implement the position-based rain check for Rain, HeavyRain, ThunderRain,
and BlueskyRain. Declare the climate weather lookup dependency and name
both functions in the function table.

The rain check matches the original function at 0x71010f33a4.

* world: keep rainfall queries const

Restore const on Manager::isRaining and make its climate weather helper
const. Both queries only read Manager state. Update their function-table
symbols; the rain check still matches the original.

0 files changed, 0 insertions, 0 deletions