feat: ✨ added load_before

[KANAjetzt]

The code from

• ✔ Load before #115

Original Description

Adds functionality to specify a mod you want to load before your own mod.

Load before field added to manifest.json in extra -> godot -> load_before

For example:
"load_before": ["Darkly77-ContentLoader"],

{
	"name": "WhatAmILookingAt",
	"namespace": "KANA",
	"version_number": "1.0.0",
	"description": "Tells you where this thing is from.",
	"website_url": "https://github.com/BrotatoMods",
	"dependencies": [],
	"extra": {
		"godot": {
			"incompatibilities": [],
			"load_before": ["Darkly77-ContentLoader"],
			"authors": ["KANA"],
			"compatible_mod_loader_version": "4.3.0",
			"compatible_game_version": ["0.8.0.3"],
			"config_defaults": {}
		}
	}
}

Will need some more testing, this is just a naive implementation.

---

closes #114

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I tested it a bit more

• Mods added to load_before should not be added to dependencies this cancels out the effect.
  Because a cyclic reference is created and the dependency check will break out of the loop, so both mods end up with the same importance score.
• It worked successfully for this simple test case
  • Mod 1 no dependencies
  • Mod 2 load_before Mod 1
  • Mod 3 dependency on Mod 1

[Qubus0]

yeah this looks good for now. I think this will work well with #122 optional dependencies, since we can just add them there and it won't complain.

[ithinkandicode]

Looks good to me, only one suggestion: The PR description says that a mod shouldn't list another mod in both its load_before and dependencies, so could there be an error if a mod developer tries to do this?

[Qubus0]

nice, well done.
@ithinkandicode duplicate in deps and load before should be handled here, that remark is just outdated

godot-mod-loader/addons/mod_loader/mod_loader.gd

Lines 508 to 511 in ff8e9d8

	# Check if it's already a dependency
	if mod.dir_name in load_before_mod_dependencies:
	ModLoaderUtils.log_debug("Load before - Skipping because it's already a dependency for %s" % load_before_id, LOG_NAME)
	continue

[KANAjetzt]

@ithinkandicode I opened #187 for that.
I will fix this with a manifest validation 👍
Ty for the review :)