Rename `bp_core_get_components()` to `bp_core_get_packaged_component_ids()`.

Ambiguous function names suck.

Props johnjamesjacoby.

See r8830.

git-svn-id: https://buddypress.svn.wordpress.org/trunk@8831 cdf35c40-ae34-48e0-9cc9-0c9da1808c22