Unified packages errors system

[xeho91]

I'd like to draw inspiration from how Svelte does it internally.

My research on how they do it

1. For each module, there's one extended class of Error - example
2. There's also one internal function wrapper e which allows more ergonomic instantiation of a new class from function parameters - example
3. For each possible kind of error, they create a function whose name is used to fill the message template from markdown file. There's a reference between function name and heading name markdown - example