Update splash screen with 3 new artworks

Also change copyright notice in splash screen & about dialog

assets/graphics/splash_screen/artworks/jessmpz.png.import

@@ -2,15 +2,15 @@
 
 importer="texture"
 type="StreamTexture"
-path="res://.import/splash_screen_image_v0.7.png-642d50de4be082a7004e97e4fa36146a.stex"
+path="res://.import/jessmpz.png-dbccabb1c0fbf170a36de90e7a060bb2.stex"
 metadata={
 "vram_texture": false
 }
 
 [deps]
 
-source_file="res://assets/graphics/splash_screen/splash_screen_image_v0.7.png"
-dest_files=[ "res://.import/splash_screen_image_v0.7.png-642d50de4be082a7004e97e4fa36146a.stex" ]
+source_file="res://assets/graphics/splash_screen/artworks/jessmpz.png"
+dest_files=[ "res://.import/jessmpz.png-dbccabb1c0fbf170a36de90e7a060bb2.stex" ]
 
 [params]
 

assets/graphics/splash_screen/artworks/roroto.png.import

@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/roroto.png-5bb796ce1a0c5bb768b883a88b3da539.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://assets/graphics/splash_screen/artworks/roroto.png"
+dest_files=[ "res://.import/roroto.png-5bb796ce1a0c5bb768b883a88b3da539.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=false
+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

assets/graphics/splash_screen/artworks/wishdream.png.import

@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/wishdream.png-2d4b51ec077caa274db44eee48928c59.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://assets/graphics/splash_screen/artworks/wishdream.png"
+dest_files=[ "res://.import/wishdream.png-2d4b51ec077caa274db44eee48928c59.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=false
+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