Multiple fixes and improvements to Mono projects

[asyncbtd]

• The mono/2.5d project has had its scripts corrected to work in godot 4.5.0
• In the mono/dodge_the_creeps project, the StartGame() and Hit() signal listeners have been added.
• In the mono/multiplayer_pong project, the collision area of ​​the paddle object was fixed.
• In the mono/pong project, the collision area of ​​the paddle, wall, and ball objects has been fixed.
• In the mono/squash_the_creeps project, added a listener for the OnPlayerHit signal. Added audio pause when a player loses a game

Is it compatible with engine version 3x? I don't know, no testing has been done.

Don't treat this as a pull request

In the future, I plan to maintain and create new demos in C#. Do I need to follow Microsoft's formatting guidelines? Or can I format the code however I want?

[aaronfranke]

real_t is intended to provide support for compiling Godot with double-precision floats with the same codebase, so it should not be replaced with float which would break that ability.

[asyncbtd]

I would have kept real_t if it worked out of the box. The problem is that in the official version of Godot, the _Process method accepts delta as a double.

Also, this example is for beginners, and I believe that if a beginner compiles Godot themselves with double precision, they can change the float themselves.

I could fix the current code to use real_t everywhere, but is that really necessary? Other C# examples don't use real_t at all.

[aaronfranke]

Then change delta and leave the rest as-is?

[asyncbtd]

It's your repository, you decide. Should I fix it?

[aaronfranke]

Is it compatible with engine version 3x? I don't know, no testing has been done.

It is not, but also, it cannot, and it does not need to be. Demos for Godot 3.x are maintained on a separate branch.

Do I need to follow Microsoft's formatting guidelines? Or can I format the code however I want?

Follow Godot's guidelines: https://docs.godotengine.org/en/latest/tutorials/scripting/c_sharp/c_sharp_style_guide.html