Fix Issue 23732 - Cannot create shared instance of class with -preview=nosharedaccess

[RazvanN7]

Revival of #14884 . cc @dkorpel @atilaneves

Also cc @Geod24 as it touches on code that you have added/modified.

I had to refactor a bit the dotvarexp code, but that is needed for this PR and it also makes the code clearer.

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Bugzilla references

Auto-close	Bugzilla	Severity	Description
✓	23732	regression	Cannot create shared instance of class with -preview=nosharedaccess

Testing this PR locally

If you don't have a local development environment setup, you can use Digger to test this PR:

dub run digger -- build "stable + dmd#14909"

[thewilsonator]

Please separate the Expressions* -> ArgumentList into a separate commit or PR

[RazvanN7]

ah damn, that's a rebase screw up