Improve file exclusion system

[VamatoHD]

I was working on a game and needed a better way to exclude files from the final build, so I did the following adjustments to the program:

Changes

1 - Replaced source in project configurations with exclude, mimicking .gitignore style, checking every file in the game directory.
2 - Automatically ignore build directory in the building process.
3 - Ignores files starting with ---@lover:ignoreFile (may need some adjustments to only check for .lua, files if needed).
4 - Automatically searches conf.lua in every directory.

Issues

1 - The changes were subjected to some tests, but not that many.
2 - Needs more validation checks.
3 - Not sure what this did but still updated it.

I'm aware that I'm not the best programmer, so feel free to modify it however you think is best.

[Wolfyxon]

The game's assets and code must be in the source directory by default, unless the user changes that in lover.toml.

Do not use the project root as the code directory.

[VamatoHD]

What if lover.toml used the following structure instead:

[directories]
source = "src"
exclude = []
build = "build"

This way, the user can exclude certain files from the defined source directory.
I can revert the changes to account for the source configuration.

[Wolfyxon]

Yeah that's exactly how it currently works and you also added exclude in [directories].

[VamatoHD]

I've reverted the changes and I don't think I have anything more to add.

[Wolfyxon]

Alright, I'll give it a proper test in a couple days.
My internet is currently really bad.

[Wolfyxon]

Works great, thanks.
Although I'll make a few adjustments before merging it to the main branch.