Added adjustable Respawn Time to CrashSite (Refactorio#957)

Based on conversation with GrilledHam:
- Respawn delay is to prevent / punish early game suicide runs to clear nests.

This implementation decreases the respawn time from default of 60 seconds to a minimum of 10 seconds, by 5 seconds per 10% of evolution.

config.lua

@@ -206,14 +206,16 @@ global.config = {
                 }
             }
         },
-        -- settings for controlling length of delay before player respawn
+        -- settings for controlling length of delay before player respawn - the delay goes *down* over time
         -- respawn time is determined by biter progression:
-        --   min_time + (increment_amount * biter_progression )
+        --   respawn_delay = max_time - (decrement_amount * biter_progression)
+        --   respawn_time = max( min_time, respawn_delay )
         -- min_time default is 10 seconds
-        -- increment_amount default of 3000 will add ~5 seconds per 10% evolution and max at 60 seconds
+        -- decrement_amount default of 3000 will remove ~5 seconds per 10% evolution
         player_respawn_time = {
           min_time = 600,
-          increment_amount = 3000
+          max_time = 3600,
+          decrement_amount = 3000
         },
     -- spawns more units when one dies
     hail_hydra = {

map_gen/maps/crash_site/entity_died_events.lua

@@ -5,6 +5,7 @@ local Global = require 'utils.global'
 local math = require 'utils.math'
 local table = require 'utils.table'
 
+local max = math.max
 local random = math.random
 local round = math.round
 local set_timeout_in_ticks = Task.set_timeout_in_ticks
@@ -174,8 +175,10 @@ local spawn_player =
     Token.register(
     function(player)
         if player and player.valid then
-            local increment = round(game.forces.enemy.evolution_factor * global.config.player_respawn_time.increment_amount)
-            player.ticks_to_respawn = global.config.player_respawn_time.min_time + increment
+            local decrement_amount = round(game.forces.enemy.evolution_factor * global.config.player_respawn_time.decrement_amount)
+            local adjusted_respawn = global.config.player_respawn_time.max_time - decrement_amount
+            local respawn_delay = max(global.config.player_respawn_time.min_time, adjusted_respawn) -- limit smallest delay to min_time, if evolution goes above 100%
+            player.ticks_to_respawn =  respawn_delay
         end
     end
 )