Symfony 5 compatability updates

[iisisrael]

Cleans up recent changes, and moves templating to Twig.

[iisisrael]

I can also try reverting the getters added to the managers and form handler that were added here only for tests, and use reflection classes for the assertions instead. And there's still two warnings and two tests marked incomplete that I can look into.

[elchris]

I can also try reverting the getters added to the managers and form handler that were added here only for tests, and use reflection classes for the assertions instead. And there's still two warnings and two tests marked incomplete that I can look into.

Oh yes I would absolutely love it if you could replace my getter/setters with reflection, I didn't do it myself because I lack experience with it, so that would be awesome.

And yes, I tried addressing those two warnings but I wasn't able to handle them, so if you could look at those too, that'd be great.

There were two tests already marked incomplete when I first pulled the project, and I added a third one indicating that it appeared to only be testing something for backward-compatibility, so I would start by looking at this 3rd one, and then perhaps if you want too look at the two older ones, that's cool too, but you might find them beyond the scope of this.

Thank you @iisisrael !!!

[iisisrael]

There were two tests already marked incomplete when I first pulled the project, and I added a third one indicating that it appeared to only be testing something for backward-compatibility

I actually removed that test, as the token storage compiler pass is no longer necessary.