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function FireGrowAndSpread()
-- check if each tile has a fire and if so, check if the fire grows and then check if it spreads to a neighbouring tile
-- firesize = the intensity of the fire within that tile from 0 -> 100.  A small fire won't spread until it becomes a larger fire.
-- firetime = the time (dt) since the fire last spread. We need to cap this so fires don't instantly grow to 100% take over the whole map.

	local firegrowspeed = 10	-- how fast a fire can grow on each tile (up to 100 (%))
	local growthreshold = 50	-- a fire that is size 50 (%) has the potential to spread
	local spreadchance = 50 	-- the chance of a fire spreading (if greater than growthreshold)
	local firetimer = 5			-- the frequency that fire growth and spread should be checked (in seconds)
	local newfiresize = 20		-- the size new fires start at (%)

	for each row
		for each col
			get firesize for current tile
			if firesize > 0 and firetime <= 0 then
				-- increse the firesize on this tile
				firesize = firesize + love.math.random(1,firegrowspeed)
				if firesize > 100 then firesize = 100
				firetime = firetimer	
				
				-- see if fire spreads to another tile
				if firesize >= growthreshold then
					if love.math.random(0,100) <= spreadchance then
						-- fire spreads
						-- determine direction
						local intRowDirection = love.math.random(-1,1)  -- this could result in 0,0 and that's okay (freebie)
						local intColDirection = love.math.random(-1,1)
						
						-- determine tile
						local newfiretilerow = row + intRowDirection
						local newfiretilecol = col + intColDirection
						
						-- check if new tile is a wall segment (walls don't catch fire)
						if newtile.tiletype = enum.tileNormal then
							-- if this new tile has no fire then start one
							if newtile.firesize < newfiresize then
								newtile.firesize = newfiresize
							end
						end
					end
				end
			end
		end
	end
end