feat: Added a handler for the Voice Channel Effect Send event

[Henonicks]

D++ didn't support the Voice Channel Effect Send event until now.

Code change checklist

• I have ensured that all methods and functions are fully documented using doxygen style comments.
• My code follows the coding style guide.
• I tested that my change works before raising the PR.
• I have ensured that I did not break any existing API calls.
• I have not built my pull request using AI, a static analysis tool or similar without any human oversight.

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[Henonicks]

Also, whoever's reviewing this, in the Discord server I've brought up removing the :s from this line:

return ":" + std::string{name} + ":";

As this is only done when the emoji doesn't have an ID. Therefore, it only adds the colons to unicode emojis and turns this:
🦆
Into this:
:🦆:
I'm willing to remove the colons, I just need someone to greenlight the decision.

[Jaskowicz1]

Renamed the title to comply with code convention

[Henonicks]

Renamed the title to comply with code convention

I forgot about that, my bad

[Jaskowicz1]

Just a couple IDE silly things

[Jaskowicz1]

I was going to write about voice_channel_effect constructor not initialising emoji, but it seems we do that in other places too (see

DPP/src/dpp/presence.cpp

Line 57 in 6915904

activity::activity(const activity_type typ, const std::string& nam, const std::string& stat, const std::string& url_) :

).

Not sure if this is something we want to address now and go through later to sort, or if this is just something to ignore @braindigitalis @Mishura4?

[Jaskowicz1]

Looks good!

[Jaskowicz1]

forgot to make my previous comment an approval, whoops