Graphics and SFX Changes

* Adds Background parallax images (not exactly parallax since we have a fixed camera)
* Adds SFX
* Fixes Pickable collisions and SFX playback

backgrounds/Blue.png.import

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+svg/scale=1.0

backgrounds/Brown.png.import

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+size_limit=0
+detect_3d=false
+svg/scale=1.0

backgrounds/Gray.png.import

@@ -0,0 +1,35 @@
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+}
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+dest_files=[ "res://.import/Gray.png-58a615d2cdd5c7d723a1f0573bdd7ed1.stex" ]
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+process/fix_alpha_border=true
+process/premult_alpha=false
+process/HDR_as_SRGB=false
+process/invert_color=false
+process/normal_map_invert_y=false
+stream=false
+size_limit=0
+detect_3d=false
+svg/scale=1.0

backgrounds/Green.png.import

@@ -0,0 +1,35 @@
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+type="StreamTexture"
+path="res://.import/Green.png-76fc8b0704fd40125f1570702f88a265.stex"
+metadata={
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+}
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+dest_files=[ "res://.import/Green.png-76fc8b0704fd40125f1570702f88a265.stex" ]
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+flags/srgb=2
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/HDR_as_SRGB=false
+process/invert_color=false
+process/normal_map_invert_y=false
+stream=false
+size_limit=0
+detect_3d=false
+svg/scale=1.0

backgrounds/Pink.png.import

@@ -0,0 +1,35 @@
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+path="res://.import/Pink.png-a067c35975d2ed27845404f5a0d12b7a.stex"
+metadata={
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+}
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+dest_files=[ "res://.import/Pink.png-a067c35975d2ed27845404f5a0d12b7a.stex" ]
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+flags/srgb=2
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+process/premult_alpha=false
+process/HDR_as_SRGB=false
+process/invert_color=false
+process/normal_map_invert_y=false
+stream=false
+size_limit=0
+detect_3d=false
+svg/scale=1.0

backgrounds/Purple.png.import

@@ -0,0 +1,35 @@
+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/Purple.png-f83a475191b77e5660227b13583a3921.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
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+source_file="res://backgrounds/Purple.png"
+dest_files=[ "res://.import/Purple.png-f83a475191b77e5660227b13583a3921.stex" ]
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+process/normal_map_invert_y=false
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+size_limit=0
+detect_3d=false
+svg/scale=1.0

backgrounds/Yellow.png.import

@@ -0,0 +1,35 @@
+[remap]
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+path="res://.import/Yellow.png-aa0149917c8f0e2a5f5aa94a63e07f5a.stex"
+metadata={
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+}
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+source_file="res://backgrounds/Yellow.png"
+dest_files=[ "res://.import/Yellow.png-aa0149917c8f0e2a5f5aa94a63e07f5a.stex" ]
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+size_limit=0
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+svg/scale=1.0