PPJ support and pre-scan namespace resolution

[nikitalita]

This implements PPJ support and pre-scanning non-PCompiler/PPJ input files for namespace resolution.

So basically, we have two different namespace resolution schemes:

"""classic""" mode:

• applies to inputs from PPJ, or if we're in PCompiler compatibility mode
• input files can be absolute or relative to any of the import directories
• namespaces are determined by the relative basedir from the input file to the import directory
• so "C:/Scripts/autoloot/fragments/terminals/something.psc" and an import directory of "C:/Scripts" ends up with an object name of "autoloot:fragments:terminals:something"

Modern mode:

• applies to all other inputs
• input files are either absolute or relative to the CWD
• the files are pre-scanned for their proper object names.

We probably want to do a refactor on the compiler nodes to have it split into two separate things; a Read/pre-parse node and everything else, since the input params for the nodes get modified after the namespace has been resolved

[nikitalita]

We probably want to remove the cwd from the default imports if we’re in modern mode; there’s no longer a need for it and it can lead to unexpected behavior.

[qudix]

Anyone still alive? /s

[Gamerooni]

hey @nikitalita, this PR is marked as draft but @Orvid has approved it. Does that mean that this code is all good to merge?

I really like this feature and I'd like to use your fork, but I do want to make sure that I won't run into any catastrophic issues on the way.

[Gamerooni]

Thank you so much!

[Gamerooni]

this might solve the build issue:
microsoft/vcpkg#38980 (comment)