Consider not requiring quotes around @tagHelperPrefix values

[pranavkm]

The usage for this is @tagHelperPrefix "th" where the value cannot have whitespaces. Unless I'm missing something obvious, there isn't a whole lot of use for the extra quotes.

[NTaylorMullen]

If we decide to do this, we should do the same for @addTagHelper and @removeTagHelper

[danroth27]

@DamianEdwards

[Eilon]

Please post an announcement when done. Also need to consider if any tooling changes are needed (including templates).

[NTaylorMullen]

Yup, will need changes across the board to react to this change. Will breakk evvverything 👿