Provides the essentials for a new weather generator that would give continuous, static pseudo-random procedural weather from a seed. First commit adds the main class that calculates the variables required (temperature, humidity, pressure) and a test function that outputs a csv file for plotting.
It is not yet plugged into the game, but the groundwork is there to replace the update_weather() function in game.cpp.
This is as of now not concerned with the gameplay aspects of weather or adding new weather types. Yet.

Conflicts:
	src/weather_gen.cpp

Added first draft of function to resolve a weather object to an in-game weather condition such as rain. Using the old weather enum for now.

Conflicts:
	src/weather_gen.cpp

[WIP] Some cleanup

clarifications

Changes the noise generator library.

This reverts commit 60d00b9.

…generator. Needs to be refined.

fix call to rotten instead of calc_rot in map.cpp
add call to calc_rot on process_active_item

Conflicts:
	src/game.cpp
	src/game.h

…her-funnels

Conflicts:
	src/map.cpp

it was there due to a bad refactoring copy-paste
don't refactor by copypasting, kids!

fired John; he was giving too precise weather reports
hired a blind weasel to make the weather reports; now they are appropriately innaccurate

so we had a party

things won't instantly rot anymore
some say this is a good thing

we had a bad day the last time that happened

this will ensure food actually rots each turn
food that never rots is bad for our business

again
the first time wasn't good enough
it will need another fix to be sure
there are never enough fixes to be sure