Roughly inspired from the code used to notify the user when a website
can be opened.
Note: The CSS style used for the message could probably go somewhere
else, but I thought it could be interesting to be able to override it.
The Physics engine is now disabled only if no sprites are moving (if they have no velocity).
Also, if a sprite is moving (if it has a velocity), the dirty state is set.
As part of an energy saving measure, we started disabling physics when the character is not moving and enabling physics again only when the character moves.
However, we enabled Physics on each frame the characeter was moving.
As a result, the Physics system would run several times, slowly slowing the computer down.
This fixes this issue by adding a flag to only enable Physics once.
This adds a global "Dirty" flag at the Game level and sets it each time the ScaleManager is modified.
This fixes a bug where the game was not redrawn when a CoWebsite was opening/closing.
Turning the "importsNotUsedAsValues" TS config value to "error".
This will require us to use `import type` instead of `import` when we are importing a value that is only used as a type (and therefore that is dropped by the Typescript compiler).
Why this change?
This is a requirement to be able to use Svelte in the future. See https://github.com/sveltejs/svelte-preprocess/issues/206#issuecomment-663193798
When stepping in Jitsi, the game webcam (from mediaManager) was not shut down.
And when enabling/disabling the webcam in Jitsi, the webcam in mediaManager was also
enabled/disabled. This PR fixes those issues.
It also fixes a race condition when closing a Jitsi where the mic/cam would be enabled at the same time.
Using the "visiblitychange" event instead of relying on a "trick" related to RAF being disabled when a window is not open allows us to have cleaner code.
Bonus: the recursive call to "setTimeout" is gone, so the stacktrace growing indefinitely is gone too.
This should make the application a bit more stable.
