Improve animated visual player demo

[marcelwgn]

Description

This improves the AnimatedVisual player demo

Motivation and Context

Closes #441

How Has This Been Tested?

Tested the following scenarios:

• Play->Pause->Play->Pause
• Play->Stop->Play
• Play->Reverse->Pause->Play
• Play->Reverse (wait for end)->Play
• Play->Reverse -> Stop -> Play

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

[marcelwgn]

@Poopooracoocoo FYI

[marcelwgn]

Update: I've fixed the sample now to return to the "play button" state once the animation finished playing. I think this now good to go feature wise.

[stmoy]

@chingucoding - thank you for the improvements. Are there other changes in flight, or am I good to merge this now?

[marcelwgn]

Unless you have anything that you would like me to change, this is good to go.