Refactor curl dependency

[ciband]

Is your feature request related to a problem? Please describe.
The hunter package manager is not ideal and is hard to work with. It also locks you into a particular version of the software, usually old.

Describe the solution you'd like
I would like to see the curl dependency converted to a git submodule for maximum flexibility.

Describe alternatives you've considered
Another option would be to use something other than curl as a submodule to accomplish the same thing.

Additional context
N/A

[sleepdefic1t]

I'd be in favor of this.

What would the solution look like on our end using submodules?
Like, what directory should the submodule go in/where in the build process/etc?

[ciband]

It should follow the same pattern we use for other submodules. cpp-crypto/src is a good example of this.

In the specific case of curl, it would go in ./src/lib/curl. Ideally, we would build curl via cmake and add_subdirectory. The framework is there but curl is complex to build.

[sleepdefic1t]

@ciband
Was able to get rid of Hunter completely and use cURL as a submodule in:
https://github.com/sleepdefic1t/PSP-OS

Big refactor is coming soon to Cpp-Client and Cpp-Crypto,
so the main SDK's will be minimal and won't need cURL at all.
PSP's (Platform Support Packages) will implement architecture-dependent code like this soon.

@faustbrian We can probably close this out now since cURL will be dropped from Cpp-Client altogether.

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