[SmootCamera] Add an action to fix the 1-frame delay.

[D8H]

This add an action to choose when the camera following must be applied to avoid a delay.

Note for reviewers: the change is only in the function:

• onPreEvents: its call DoMoveCameraCloser
• MoveCameraCloser: it calls DoMoveCameraCloser
• DoMoveCameraCloser: contains what was in onPreEvents

The delay does some kind of glitch.

• Camera following in the life-cycle function: 1 frame delay
  https://games.gdevelop-app.com/game-c29f6b40-81cd-422f-b683-372675135e66/index.html

• Camera following after the player movement though an action: no delay
  https://games.gdevelop-app.com/game-5d60504f-534f-4194-b9d0-b0b3649c3fbc/index.html

Example:

• [platformer-with-tilemap] Add a linear camera following. GDevelop-examples#364