Allow customized HTML elements in bbp_get_topic_author_role

[netweb]

Previously the <div> HTML element was hardcoded and you could only change the CSS class with bbp_parse_args

<?php bbp_topic_author_role( array( 'before' => '<p>', 'class' => 'bbp-author-role', 'after' => '</p>' ) ); ?>

The above would render as <p><div class="bbp-author-role">Keymaster</div></p>

Now before defaults to <div class="bbp-author-role"> and after defaults to </div>

Thus now:

<?php bbp_topic_author_role( array( 'before' => '<p>', 'after' => '</p>' ) ); ?>

Now the above renders as <p>Keymaster</p> and brings bbp_get_topic_author_role before/after functionality similar to other (majority) bbPress functions.

[netweb]

Just did something similar for bbp_author_ip in #2519, moving to 2.6

[johnjamesjacoby]

In 5513:

Simplify topic & reply author role markup arguments, with backpat support. Props netweb. Fixes #2557.