excaliburjs / Excalibur / 6613

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fix: [#1417] [#1431] Loader positioning, allow customization, clean-up html (#1507)

Closes #1417
Closes #1431

## Changes:

- Adds an id to the play button root element `#excalibur-play-root`
- Allows modification of all loader positioned elements
   - Logo
   - Play button
   - Loading bar
- Additionally allows the loading bar color to be set

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