assets: add escher test images

game/assets/escher_convex_concave.jpg.import

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+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/escher_convex_concave.jpg-493a4b3d286c5a35b8ae5646f4eba464.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://assets/escher_convex_concave.jpg"
+dest_files=[ "res://.import/escher_convex_concave.jpg-493a4b3d286c5a35b8ae5646f4eba464.stex" ]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_mode=0
+compress/bptc_ldr=0
+compress/normal_map=0
+flags/repeat=0
+flags/filter=true
+flags/mipmaps=false
+flags/anisotropic=false
+flags/srgb=2
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/HDR_as_SRGB=false
+process/invert_color=false
+stream=false
+size_limit=0
+detect_3d=true
+svg/scale=1.0

game/assets/escher_lizards.jpg.import

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+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/escher_lizards.jpg-7c78103b5c79b51d60a6549be5e01a43.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://assets/escher_lizards.jpg"
+dest_files=[ "res://.import/escher_lizards.jpg-7c78103b5c79b51d60a6549be5e01a43.stex" ]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_mode=0
+compress/bptc_ldr=0
+compress/normal_map=0
+flags/repeat=0
+flags/filter=true
+flags/mipmaps=false
+flags/anisotropic=false
+flags/srgb=2
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/HDR_as_SRGB=false
+process/invert_color=false
+stream=false
+size_limit=0
+detect_3d=true
+svg/scale=1.0