add pixel art assets, make prototype overworld

assets/city_tiles/Buildings.png.import

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assets/city_tiles/Fence.png.import

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+}
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+size_limit=0
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+svg/scale=1.0

assets/city_tiles/Fence_Gate_Animations.png.import

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+[remap]
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+type="StreamTexture"
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+}
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+[deps]
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+dest_files=[ "res://.import/Fence_Gate_Animations.png-694e963e246657f21db7b57f25ae002f.stex" ]
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+stream=false
+size_limit=0
+detect_3d=true
+svg/scale=1.0

assets/city_tiles/Street.png.import

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+[remap]
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+type="StreamTexture"
+path="res://.import/Street.png-2dcb82560a90eaf012209f5af1f40563.stex"
+metadata={
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+}
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+[deps]
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+dest_files=[ "res://.import/Street.png-2dcb82560a90eaf012209f5af1f40563.stex" ]
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+[params]
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+process/HDR_as_SRGB=false
+process/invert_color=false
+stream=false
+size_limit=0
+detect_3d=true
+svg/scale=1.0

assets/city_tiles/Terrain.png.import

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+[remap]
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+type="StreamTexture"
+path="res://.import/Terrain.png-92747e60918a1ab728ef0f50449174e4.stex"
+metadata={
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+}
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+[deps]
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+dest_files=[ "res://.import/Terrain.png-92747e60918a1ab728ef0f50449174e4.stex" ]
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+process/HDR_as_SRGB=false
+process/invert_color=false
+stream=false
+size_limit=0
+detect_3d=true
+svg/scale=1.0

assets/city_tiles/_Example.png.import

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+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/_Example.png-7e9015adb23ac3ff00aab4c89f7685a0.stex"
+metadata={
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+}
+
+[deps]
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+source_file="res://assets/city_tiles/_Example.png"
+dest_files=[ "res://.import/_Example.png-7e9015adb23ac3ff00aab4c89f7685a0.stex" ]
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