Excalibur v0.20.0

Thanks to @T00mm , @atanasbozhkov for their contributions!

Breaking Changes

• ex.PauseAfterLoaderremoved, use Use ex.Loader instead

Added

• Added strongly typed EvenTypes enum to Events.ts to avoid magic strings #1066

Changed

• Added parameter on SpriteSheet constructor so you can define how many pixel spacing is between sprites #1058

Fixed

• Fixed issue where there were missing files in the dist (Loader.css, Loader.logo.png) (#1057)