1st Round of Doodad Sprites + Improve Doodad Tool

* Improve the `doodad convert` command to convert a series of input
  images into multiple Frames of a Doodad:
  `doodad convert frame1.png frame2.png frameN.png output.doodad`
* Add the initial round of dev-asset sprites for the default Doodads:
  * Button, Button-TypeB and Sticky Button
  * Red, Blue, Green and Yellow Locked Doors and Keys
  * Electric Door
  * Trapdoor Down
* Add dev-assets/palette.json that defines our default doodad color
  palette. Eventually the JSON will be used by the `doodad` tool to give
  the layers meaningful names.

dev-assets/doodads/buttons/README.md

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+# Button Doodads
+
+```bash
+doodad convert -t "Sticky Button" sticky1.png sticky2.png sticky-button.doodad
+doodad install-script sticky.js sticky-button.doodad
+
+doodad convert -t "Button" button1.png button2.png button.doodad
+doodad install-script button.js button.doodad
+
+doodad convert -t "Button Type B" typeB1.png typeB2.png button-typeB.doodad
+doodad install-script button.js button-typeB.doodad
+```

dev-assets/doodads/buttons/button.js

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+function main() {
+	console.log("Sticky Button initialized!");
+
+	Events.OnCollide( function() {
+		console.log("Touched!");
+		Self.Canvas.SetBackground(RGBA(255, 153, 0, 153))
+	})
+}

dev-assets/doodads/buttons/sticky.js

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+function main() {
+	console.log("Sticky Button initialized!");
+
+	Events.OnCollide( function() {
+		console.log("Touched!");
+		Self.Canvas.SetBackground(RGBA(255, 153, 0, 153))
+	})
+}

dev-assets/doodads/doors/README.md

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+# Button Doodads
+
+```bash
+doodad convert -t "Red Door" red1.png red2.png red-door.doodad
+doodad convert -t "Blue Door" blue1.png blue2.png blue-door.doodad
+doodad convert -t "Green Door" green1.png green2.png green-door.doodad
+doodad convert -t "Yellow Door" yellow1.png yellow2.png yellow-door.doodad
+
+doodad convert -t "Red Key" red-key.png red-key.doodad
+doodad convert -t "Blue Key" blue-key.png blue-key.doodad
+doodad convert -t "Green Key" green-key.png green-key.doodad
+doodad convert -t "Yellow Key" yellow-key.png yellow-key.doodad
+
+doodad convert -t "Electric Door" electric{1,2,3,4}.png electric-door.doodad
+```

dev-assets/doodads/palette.json

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+{
+	"#000000": {
+		"name": "black"
+	},
+	"#666666": {
+		"name": "dark-grey"
+	},
+	"#999999": {
+		"name": "grey"
+	},
+	"#CCCCCC": {
+		"name": "light-grey"
+	},
+	"#FF0000": {
+		"name": "red"
+	},
+	"#0099FF": {
+		"name": "light-blue"
+	},
+	"#0000FF": {
+		"name": "blue"
+	},
+	"#009900": {
+		"name": "green"
+	},
+	"#999900": {
+		"name": "gold"
+	},
+	"#4D391B": {
+		"name": "brown"
+	},
+	"#8B652C": {
+		"name": "light-brown"
+	}
+}

dev-assets/doodads/trapdoors/README.md

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+# Button Doodads
+
+```bash
+doodad convert -t "Trapdoor Down" down{1,2,3}.png trapdoor-down.doodad
+```