Add white room browsing mode

room.lua

@@ -140,7 +140,8 @@ function Room:draw()
 	-- draw only the channels the player has. Each object just exposes sprites per
 	-- channel via Entity:draw(channel); a door registered on all three channels
 	-- naturally draws its red sprite on the red pass, etc. No per-object logic.
-	for _, channel in ipairs(self.colorsPlayerHas) do
+	local drawChannels = gameWorld and gameWorld.roomBrowseMode and {"red", "green", "blue"} or self.colorsPlayerHas
+	for _, channel in ipairs(drawChannels) do
 		if self.player[channel] then self.player[channel]:draw(channel) end
 		for _, entity in pairs(self.collideables[channel]) do entity:draw(channel) end
 		-- The zoomed-out neighbourhood already draws every room directly. Calling
@@ -201,8 +202,11 @@ function Room:drawWiresAt(originX, originY, cellSize, selectedCircuit, editorCol
 	table.sort(ordered)
 
 	love.graphics.setBlendMode("alpha")
-	local visibleColors = {red = false, green = false, blue = false}
-	for _, color in ipairs(self.colorsPlayerHas or {}) do visibleColors[color] = true end
+	local showAllChannels = gameWorld and gameWorld.roomBrowseMode
+	local visibleColors = {red = showAllChannels, green = showAllChannels, blue = showAllChannels}
+	if not showAllChannels then
+		for _, color in ipairs(self.colorsPlayerHas or {}) do visibleColors[color] = true end
+	end
 	local editorIsOn = editorView ~= nil and editorView ~= "off"
 	for _, circuitId in ipairs(ordered) do
 		local selected = not selectedCircuit or selectedCircuit == circuitId