Replaced anonymous enums with constexpr per #2328

[gnawme]

Thanks a lot for making a contribution to SFML! 🙂

Before you create the pull request, we ask you to check the follow boxes. (For small changes not everything needs to ticked, but the more the better!)

• Has this change been discussed on the forum or in an issue before?
• Does the code follow the SFML Code Style Guide?
• Have you provided some example/test code for your changes?
• If you have additional steps which need to be performed list them as tasks!

---

Description

Please describe your pull request.

This PR is related to the issue #2328

Tasks

• Tested on Linux
• Tested on Windows
• Tested on macOS
• Tested on iOS
• Tested on Android

How to test this PR?

Enabled test suite, all tests pass.

[codecov]

Codecov Report

Merging #2377 (a64fad2) into master (ca5ca65) will increase coverage by 0.00%.
The diff coverage is 0.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2377   +/-   ##
=======================================
  Coverage   14.40%   14.40%           
=======================================
  Files         212      212           
  Lines       17898    17897    -1     
  Branches     4397     4397           
=======================================
  Hits         2578     2578           
+ Misses      15146    15144    -2     
- Partials      174      175    +1     

Impacted Files	Coverage Δ
include/SFML/Graphics/RenderTarget.hpp	0.00% <ø> (ø)
include/SFML/Network/Socket.hpp	50.00% <ø> (ø)
include/SFML/Network/UdpSocket.hpp	0.00% <ø> (ø)
include/SFML/Window/Joystick.hpp	0.00% <ø> (ø)
src/SFML/Window/Win32/JoystickImpl.cpp	0.71% <0.00%> (ø)
src/SFML/Audio/SoundStream.cpp	0.00% <0.00%> (ø)
src/SFML/Audio/SoundRecorder.cpp	0.00% <0.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update ca5ca65...a64fad2. Read the comment docs.

[Bromeon]

You removed the API documentation everywhere. Can you add it back?

[gnawme]

You removed the API documentation everywhere. Can you add it back?

I did what? How?

[ChrisThrasher]

You removed the API documentation everywhere. Can you add it back?

I did what? How?

If you look at the diff, you'll see that you removed some documentation comments.

[ChrisThrasher]

There are more issues with signed/unsigned comparisons. If there's a clean fix then I'm cool with us making that. Otherwise let's just make those constants ints like they were before so we can keep this PR neatly contained to solving just a single problem.