Add day/night cycle options (#360)

* Add day/night cycle options

* txt to markdown and fix formatting errors

map_gen/day_night_cycles/bright.lua

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+-- 10 minute cycle, 4m of full light, 4m light to dark, 6s full dark, 2m dark to light
+game.player.surface.ticks_per_day = 36000
+game.player.surface.dusk = 0.2
+game.player.surface.evening = 0.59
+game.player.surface.morning = 0.6
+game.player.surface.dawn = 0.8

map_gen/day_night_cycles/day_night_cycle.lua

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+local Event = require "utils.event"
+
+-- Uncomment the desired day/night cycle
+
+-- requires
+-- requires
+
+local function init()
+end
+
+Event.on_init(init)

map_gen/day_night_cycles/double_length_cycle.lua

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+-- ~14 minute cycle, 6m56s of full light, 2m46s light to dark, 1m24s full dark, 2m46s dark to light
+game.player.surface.ticks_per_day = 50000
+game.player.surface.dusk = 0.25
+game.player.surface.evening = 0.45
+game.player.surface.morning = 0.55
+game.player.surface.dawn = 0.75

map_gen/day_night_cycles/gloomy.lua

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+-- 10 minute cycle, 6s of full light, 2m light to dark, 4m full dark, 4m dark to light
+game.player.surface.ticks_per_day = 36000
+game.player.surface.dusk = 0
+game.player.surface.evening = 0.2
+game.player.surface.morning = 0.6
+game.player.surface.dawn = 0.99

map_gen/day_night_cycles/half_length_cycle.lua

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+-- ~3.5 minute cycle, 1m44s of full light, 42s light to dark, 21s full dark, 42s dark to light
+game.player.surface.ticks_per_day = 12500
+game.player.surface.dusk = 0.25
+game.player.surface.evening = 0.45
+game.player.surface.morning = 0.55
+game.player.surface.dawn = 0.75

map_gen/day_night_cycles/long_days_long_nights_fast_transitions.lua

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+-- 20 minute cycle, 9m of full light, 1m light to dark, 9m full dark, 1m dark to light
+game.player.surface.ticks_per_day = 72000
+game.player.surface.dusk = 0.225
+game.player.surface.evening = 0.275
+game.player.surface.morning = 0.725
+game.player.surface.dawn = 0.775

map_gen/day_night_cycles/readme.md

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+In terms of daylight during the day/night cycle:
+
+when dusk begins the light decreases until
+evening (aka nighttime) which is full darkness until
+morning which increases the light level until
+dawn (aka daytime) which is full brightness until dusk
+
+Defaults as follows:
+ticks_per_day=25000 (approx 6 mins 56.4 secs)
+dusk=0.25, evening=0.45, morning=0.55, dawn=0.75
+
+If you keep your numbers < 1 , it's the percentage
+of the total ticks at which the phase of day will change
+Not sure what happens if you go > 1
+
+When setting these variables, the command will fail if it changes
+the *order* of the phases. Ex: morning must be > evening but < dawn
+
+Lastly, the map starts at time tick 0 so if you want to start during full
+daylight you want a dusk > 0

map_gen/day_night_cycles/vanilla.lua

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+-- vanilla day/night cycle, mostly just here as reference
+-- ~7 minute cycle, 3m28s of full light, 1m23s light to dark, 42s full dark, 1m23s dark to light
+game.player.surface.ticks_per_day = 25000
+game.player.surface.dusk = 0.25
+game.player.surface.evening = 0.45
+game.player.surface.morning = 0.55
+game.player.surface.dawn = 0.75