Delete SimpleCamera

[pushfoo]

Changes

1. Remove SimpleCamera from arcade.camera's __init__.py
2. Delete the simple_camera.py file itself

Why

TL;DR: We'd have to rewrite SimpleCamera again + Discord discussion suggests nobody actually wants SimpleCamera around

It's Not Actually 2.6 Compatible

The current SimpleCamera isn't API-compatible with 2.6. Instead, it's a rewrite of a rewrite started before 3.0. See the blue forks on this timeline (credit goes to @DigiDuncan):

Green is development, yellow appears to be WIP code

Nothing Actually Uses It

• Chesterton's Fence Checks: satisfied
  • Nothing actually uses it in the examples or anywhere else
  • It's not referenced in the doc
  • There's no usage outside an import in arcade.camera
  • Tutorials fully updated as they can be pending Expose Camera2D in arcade's top level namespace #2055

Camera2D.from_raw_data is the best porting option

TL;DR: Add migration guide showing how to convert code to use the class method

Core Concept	How SimpleCamera Fails to Deliver
2.6-compatible arguments	Current implementation needs rewrite to be 2.6-comaptible
move_to / update methods	Broken behavior replaced by grips and controllers + update doesn't accept a time step

Other compatibility approaches were disliked

The following options were disliked in Discord discussion:

Option	Reason(s) for Dislike
Camera which acts like 2.6 but logs deprecation warning to console	People will expect future compatibility, console warnings might get missed
Camera import raises an ImportError on use + links a migration guide	A broken import in the default library is ugly
Rewriting for compatibility yet another time	We have already done this too many times

[DigiDuncan]

Huge +1.

[pushfoo]

The CI failures are pyright being angry about the GUI again.

[pushfoo]

We can still merge this if we want, but the platformer tutorial still references SimpleCamera. PyCharm's search scoping may have excluded .rst when I looked.

[alejcas]

There's no reasons to have simplecamera with carmera2d

[einarf]

Good stuff 👍