Animation: initial mechanism

[pkulev]

Closes issue(s): [ #26 ]

Description of the changes:

• What's new: Animation system
• Fixes:
• Refactoring:

Reviewers: [ @taptap ]

Task list:

• [x] submit pull request
• [x] review
• [x] testing
• [x] fixes after review, squashing, rebasing to master

[codecov-io]

Current coverage is 55.34% (diff: 90.08%)

Merging #28 into master will increase coverage by 2.80%

@@             master        #28   diff @@
==========================================
  Files            36         38     +2   
  Lines          1608       1729   +121   
  Methods           0          0          
  Messages          0          0          
  Branches          0          0          
==========================================
+ Hits            845        957   +112   
- Misses          763        772     +9   
  Partials          0          0          

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[alex-eg]

feature-behaviour

Peculiar branch name. Just noticed.