Added some sample particles (ci skip) (#1594)

Co-authored-by: Semphris <semphris@protonmail.com>

data/particles/generic/bubbles.stcp

@@ -0,0 +1,45 @@
+(supertux-custom-particle
+  (texture
+    (surface "particles/generic/bubble.png")
+    (color_r 1)
+    (color_g 1)
+    (color_b 1)
+    (color_a 1)
+    (likeliness 1)
+    (scale_x 1)
+    (scale_y 1)
+  )
+  (texture
+    (surface "particles/generic/bubble.png")
+    (color_r 1)
+    (color_g 1)
+    (color_b 1)
+    (color_a 1)
+    (likeliness 2)
+    (scale_x 0.5)
+    (scale_y 0.5)
+  )
+  (texture
+    (surface "particles/generic/bubble.png")
+    (color_r 1)
+    (color_g 1)
+    (color_b 1)
+    (color_a 0.5)
+    (likeliness 1)
+    (scale_x 0.75)
+    (scale_y 0.75)
+  )
+  (z-pos 0)
+  (main-texture "/images/engine/editor/sparkle.png")
+  (amount 100)
+  (lifetime 10)
+  (birth-time 0)
+  (death-mode "fade")
+  (death-time 0.75)
+  (acceleration-y -256)
+  (friction-x 2)
+  (friction-y 2)
+  (feather-factor 1)
+  (collision-mode "destroy")
+  (cover-screen #f)
+)

data/particles/generic/leaves.stcp

@@ -0,0 +1,44 @@
+(supertux-custom-particle
+  (texture
+    (surface "particles/generic/leaf.png")
+    (color_r 1)
+    (color_g 1)
+    (color_b 1)
+    (color_a 1)
+    (likeliness 1)
+    (scale_x 1)
+    (scale_y 1)
+  )
+  (texture
+    (surface "particles/generic/leaf.png")
+    (color_r 1)
+    (color_g 1)
+    (color_b 1)
+    (color_a 1)
+    (likeliness 1)
+    (scale_x 0.75)
+    (scale_y 0.75)
+  )
+  (z-pos 0)
+  (main-texture "/images/engine/editor/sparkle.png")
+  (amount 10)
+  (delay 0.5)
+  (lifetime 10)
+  (birth-time 0)
+  (death-mode "fade")
+  (death-time 0.75)
+  (speed-var-x 256)
+  (speed-var-y 256)
+  (acceleration-y 200)
+  (friction-x 1)
+  (friction-y 1)
+  (feather-factor 1)
+  (rotation-variation 360)
+  (rotation-speed 360)
+  (rotation-speed-variation 360)
+  (rotation-decceleration 1)
+  (rotation-mode "wiggling")
+  (collision-mode "bounce-heavy")
+  (offscreen-mode "always")
+  (cover-screen #f)
+)

data/particles/generic/snow.stcp

@@ -0,0 +1,76 @@
+(supertux-custom-particle
+  (texture
+    (surface "images/particles/snow0.png")
+    (color_r 1)
+    (color_g 1)
+    (color_b 1)
+    (color_a 1)
+    (likeliness 1)
+    (scale_x 1)
+    (scale_y 1)
+  )
+  (texture
+    (surface "images/particles/snow1.png")
+    (color_r 1)
+    (color_g 1)
+    (color_b 1)
+    (color_a 1)
+    (likeliness 1)
+    (scale_x 1)
+    (scale_y 1)
+  )
+  (texture
+    (surface "images/particles/snow2.png")
+    (color_r 1)
+    (color_g 1)
+    (color_b 1)
+    (color_a 1)
+    (likeliness 1)
+    (scale_x 1)
+    (scale_y 1)
+  )
+  (texture
+    (surface "particles/generic/puff_round.png")
+    (color_r 1)
+    (color_g 1)
+    (color_b 1)
+    (color_a 0.02)
+    (likeliness 1)
+    (scale_x 0.25)
+    (scale_y 0.25)
+  )
+  (texture
+    (surface "particles/generic/puff_round.png")
+    (color_r 1)
+    (color_g 1)
+    (color_b 1)
+    (color_a 0.1)
+    (likeliness 1)
+    (scale_x 0.1)
+    (scale_y 0.1)
+  )
+  (z-pos 0)
+  (main-texture "/images/engine/editor/sparkle.png")
+  (amount 500)
+  (delay 0.05)
+  (lifetime 10)
+  (birth-time 0)
+  (death-mode "fade")
+  (death-time 0.75)
+  (speed-x 256)
+  (speed-y 256)
+  (speed-var-x 256)
+  (speed-var-y 256)
+  (acceleration-x 128)
+  (acceleration-y 128)
+  (friction-x 2)
+  (friction-y 2)
+  (feather-factor 0.5)
+  (rotation 360)
+  (rotation-variation 360)
+  (rotation-speed 360)
+  (rotation-decceleration 10)
+  (rotation-mode "wiggling")
+  (collision-mode "stick")
+  (cover-screen #f)
+)