fix state thigns and port to love11

_helpers.lua

@@ -58,7 +58,8 @@ function clearRuntimeSaveData(roomName)
 	end
 
 	local function removeTree(path)
-		if love.filesystem.isDirectory(path) then
+		local info = love.filesystem.getInfo(path)
+		if info and info.type == "directory" then
 			for _, child in ipairs(love.filesystem.getDirectoryItems(path)) do
 				removeTree(path .. "/" .. child)
 			end
@@ -109,16 +110,18 @@ function cellShapeFromBox(box)
 	return cells
 end
 
--- Which 16x16 cells of a sprite are non-empty, for multi-cell collision shapes.
-function getCellsFromSprite(sprite)
-	local w, h = sprite:getWidth(), sprite:getHeight()
+-- Which 16x16 cells of an image are non-empty, for multi-cell collision
+-- shapes. LÖVE 11 no longer exposes Image:getData(), so inspect ImageData
+-- directly instead of creating a GPU Image first.
+function getCellsFromSprite(spritePath)
+	local img = love.image.newImageData(spritePath)
+	local w, h = img:getWidth(), img:getHeight()
 	local box = {w = w / 16, h = h / 16}
 	local boxCells = cellShapeFromBox(box)
 	if box.w < 1 or box.h < 1 then
 		return boxCells
 	end
 
-	local img = sprite:getData()
 	local cellsToRemove = {}
 
 	for _, cell in pairs(boxCells) do