Template screens and actions are hooked to 'wp' instead of 'template_redirect'

[johnjamesjacoby]

Back when we audited the actions in 1.5, we kept some things hooked on to 'wp' for future investigation. Now that all of the hooks have been consolidated, we can safely move things onto dedicated template_include and template_redirect actions where needed.

[johnjamesjacoby]

(In [5813]) Move bp_screens and bp_actions onto bp_template_redirect action, which is hooked to template redirect.

• Moves template redirecting where it belongs, the template_redirect action
• Leaves bp_ready hooked to 'wp' for now, pending testing
• Anything hooked to bp_ready works the way it always did
• Anything properly hooked to bp_actions and bp_screens works normally
• Fully backwards compatible
• Fixes #4029

[johnjamesjacoby]

(In [5817]) Introduce _bp_maybe_remove_redirect_canonical() as a stop-gap to prevent WordPress from confusing BuddyPress faux URLs with existing rewrite rule matches. See #4029.