Updating to dotnet 6.0.

Cleaning up Gulp tasks, readme, and testing for GitHub action.

Fixxing version numbers in release body.

Fixed crash when recording gif, removed bounce when walking off ladde…

…rs, replaced icon, and created documentation.

Fixed mouse cursor in editor and map crashing without player, key, or…

… door.

Fixed bug with air not counting down, ending/restarting game, and score.

Added save support.

Added support for unlocking door, collecting gem, and exiting level.

Fixes to PV8 renderer and cleaning up exit, respawn, and game over ti…

…mers.

Fixes to PV8 renderer and cleaning up exit, respawn, and game over ti…

…mers.