@NeedsPath and platform dependency resolution

[markehammons]

From #122

If you do not provide an absolute file name (file ending with .so or .dll), Slinc will use the base file name provided along with the appropriate library suffix for the OS and a tag based on the architecture.
https://slinc.hammons.fr/docs/docs/reference/library-modules.html#

Can we regard file ending with .dylib as absolute file name too?

This is just an idea, but I think it would be nice to be able to specify a file name without conversion. I mean something like the following example.

@NeedsFile("build/name") // => converted into /path/to/name_{suffix}.so, path/to/name_{suffix}.dll
@NeedsFile("`build/name`") //=> path/to/name

I am open to this, but I'd like to have a specific annotation for both of these behaviors rather than special string syntax. I think it makes things easier to read and understand.

Personally, I see the platform dependency resolution being the default that most people use. It allows for simple dependency declaration that works on multiple different hosts and platforms. Considering that, maybe we change @NeedsFile to have this behavior, and create @NeedsSpecificFile for when you want to use a specific file, regardless of platform.