Make Cubos compatible with CMake find_package

[RiscadoA]

Description

I tried to quickly give this a shot for 0.4 but it was way more complex than I anticipated.
I ended up needing to refactor pretty much the whole CMake configuration, as dealing with two libs at once (engine and core), plus their dependencies, of which some are obtained from add_subdirectory instead of find_package, was a big pain.

Sorry for not breaking this PR up further. I didn't work on this in a very structured way because the solution wasn't clear from the beginning. To sum it up, this PR achieves the following:

• Makes Cubos find_package compatible. This means that now, Cubos can be installed by building the 'install' target, and can then be used in other projects (e.g. cubos-demo) through find_package(cubos), which is great, and way more standard!

• Replaces all git submodules by CMake calls to FetchContent. Internally, FetchContent may end up creating git submodules, but the whole process is hidden from the user. I decided to change to this system because submodule integrate very badly with find_package, and I wasn't able to get it working. Also, I think everyone is tired of messing around with submodules, so this is a big QOL plus.

• Make the process of deploying Cubos applications way easier. Tesseratos is an example of this - it can now be installed with the 'install' target! Basically I just setup some 'wiring' to make it possible to either pick the assets folder from the development source directory, or from the current directory. This can be toggled with the TESSERATOS_DISTRIBUTE option. The latter is what we want when we're deploying.

• A very big cleanup on the whole CMake config, making it nicer to read and more organized, with proper comments. This was pretty much necessary to get the other things done.

One final thing: to put this all to test, I packaged Cubos with Nix! Maybe we can get it on nixpkgs on the next update 👀

Checklist

• Self-review changes.
• Evaluate impact on the documentation.
• Add entry to the changelog's unreleased section.

[github-actions]

PR Preview Action v1.4.8
🚀 Deployed preview to https://GameDevTecnico.github.io/cubos/preview/pr-1327/
on branch gh-pages at 2024-11-22 09:56 UTC

[codecov]

Codecov Report

Attention: Patch coverage is 43.47826% with 13 lines in your changes missing coverage. Please review.

Project coverage is 54.23%. Comparing base (dcb021c) to head (67a2023).
Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
engine/src/assets/plugin.cpp	40.00%	12 Missing ⚠️
core/src/al/miniaudio_context.cpp	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1327       +/-   ##
===========================================
+ Coverage   41.94%   54.23%   +12.29%     
===========================================
  Files         441      438        -3     
  Lines       33129    25338     -7791     
  Branches     3872     2347     -1525     
===========================================
- Hits        13895    13742      -153     
+ Misses      19234    11596     -7638     

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[github-actions]

⚠️ Clang-Tidy found issue(s) with the introduced code (1/1)

[jdbaracho]

I don't understand much about CMake so I can't really comment on the code itself, however by the description seems like a great QoL update for both devs and users!

[SrGesus]

Works on my machine LGTM

[diogomsmiranda]

LGTM!!