Add Calcopus Spine demo

examples/calcopus-spine-demo/README.md

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+# Calcopus
+
+An example of project with Spine object used. Player needs to resolve simple math tasks quickly in order to find the lowest value.
+What is demonstrated in this project:
+
+- How to add Spine object to scene
+- How to switch Spine animations depending on game conditions
+- How to use other standart objects, like text layers, in combination with Spine animations

examples/calcopus-spine-demo/assets/Octopus.atlas

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+Octopus.png
+size:1919,396
+filter:Linear,Linear
+scale:0.8
+body
+bounds:525,94,300,393
+rotate:90
+eye_fail_L
+bounds:1817,18,27,33
+rotate:90
+eye_fail_R
+bounds:1866,236,27,35
+eye_light_L
+bounds:1258,2,21,19
+eye_light_R
+bounds:1231,165,16,16
+offsets:1,1,18,18
+eyelid_lower_L
+bounds:1578,7,84,38
+offsets:1,0,85,38
+eyelid_lower_R
+bounds:1664,3,83,42
+offsets:1,0,85,42
+eyelid_upper_L
+bounds:1855,308,86,62
+rotate:90
+eyelid_upper_R
+bounds:379,30,89,65
+offsets:0,0,89,66
+eyewhites
+bounds:470,8,197,84
+glasses
+bounds:1634,302,219,92
+glasses_linses
+bounds:669,24,186,68
+glasses_sh
+bounds:1634,229,230,71
+mouth_idle
+bounds:857,13,79,48
+offsets:1,1,80,52
+rotate:90
+mouth_sad
+bounds:1749,20,66,25
+offsets:0,0,66,26
+popup
+bounds:2,97,521,297
+offsets:2,1,525,299
+pupil_L
+bounds:1866,273,35,33
+offsets:0,0,35,34
+pupil_R
+bounds:1589,248,34,37
+offsets:1,0,37,37
+tentacle_01
+bounds:2,9,86,375
+offsets:0,0,86,376
+rotate:90
+tentacle_02
+bounds:920,165,229,309
+rotate:90
+tentacle_03
+bounds:1231,287,107,401
+rotate:90
+tentacle_04
+bounds:1589,47,180,326
+offsets:0,0,181,329
+rotate:90
+tentacle_05
+bounds:920,5,158,336
+rotate:90
+tentacle_06
+bounds:1231,183,102,356
+rotate:90
+tentacle_07
+bounds:1258,23,158,318
+rotate:90