Refactor Laravel-specific code

[jnoordsij]

This PR aimed to add support for Laravel 10, which was later introduced in #321.

It's remaining parts is refactoring some things to allow for easier static code analysis within IDE, to allow spotting deprecations and/or removals from Laravel more easily. It also specifically lists all used Illuminate dependencies in composer.json.

ToDo:

• Actually test this on a real life Laravel application, as there is no test suite

[barryvdh]

Thanks, did you get a chance to test this? Are the changes required or can we bump the versions for now?

[barryvdh]

I've tagged a versions which allows Laravel 10, but will consider this as an improvement.

[jnoordsij]

@barryvdh thanks for looking into this! I wasn't able to test this in my application yet, but a quick test round in a fresh Laravel skeleton allowed me to publish everything and use basic operations without any problems. So I think the Laravel 10 support is good to go!

I've rebased my branch so you can still merge in the changes. You're correct none of them are actually required for Laravel 10, they basically were the easiest way for me to check basic compatibility in terms of classes/functions using just an IDE. Nonetheless I think they're very useful to keep this package up to date ;)

[jnoordsij]

Subtle reminder this is still open; if there is anything I can do here, let me know!