Add random townie character

Draw the character in Aseprite as layers. Each layer has a part variant
and offset encoded in its name. For example:

- "head_003" for variant 3 of the character head.

- "body_002.dy_-12" for variant 2 of the character body,
  and an offset of -12 in the Y axis.

Export each part variant as PNG. Create a scene with one
AnimatedSprite2D node per part. Use the character sprite randomizer to
randomly set the multiple PNGs of each part. Also use the cel-shading
node and material in each part with skin. Add the character randomizer
to the root node.

Also add a test scene with multiple townies instantiated. Add talker
behavior to them and some dialogue explanation.

Author: manuq

scenes/game_elements/characters/components/character_randomizer_test.dialogue

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+# SPDX-FileCopyrightText: The Threadbare Authors
+# SPDX-License-Identifier: MPL-2.0
+~ townie_1
+Hey, I'm not just a random guy. I have a very unique seed number.
+=> salute
+~ townie_2
+I'm blue! If you are happy with the random results, except for a thing...
+...you can activate Editable Children and then reset the character seed to zero. Then apply any changes to the inner nodes.
+=> salute
+~ townie_3
+~ townie_4
+~ salute
+[[See you around.|Welcome to the town!]]
+=> END

scenes/game_elements/characters/components/character_randomizer_test.dialogue.import

@@ -0,0 +1,16 @@
+[remap]
+
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+importer_version=15
+type="Resource"
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+path="res://.godot/imported/character_randomizer_test.dialogue-40cb32867b5a5020b3c0cb6723f4f46d.tres"
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scenes/game_elements/characters/components/character_randomizer_test.tscn

@@ -0,0 +1,40 @@
+[remap]
+
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scenes/game_elements/characters/npcs/components/townie-body_001.png

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scenes/game_elements/characters/npcs/components/townie-body_001.png.import

@@ -0,0 +1,40 @@
+[remap]
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+}
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+
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