BuddyPress 12.0 compat

[boonebgorges]

I'm going to be working on BP 12.0 compat for the plugin.

Main tasks as I understand them at the moment:

• [x] Replace all URL concatenation with BP API functions
• [x] Ensure that component/group extension registration is compatible with new system
• [x] Backward compatibility layer

Regarding the latter: After some thought, I think that my strategy will be to do a straightforward update of the plugin so that it's built for BP 12.0. Then, in order to support cases where someone updates BPGES but not BP, I'll have a drop-in file that provides missing functions like bp_members_get_user_url(), wrapping the legacy functions. This file will pretty much be a drop-in that can be used with a number of different BP plugins that I maintain, so I'm hopeful that this approach will save some work.

[boonebgorges]

Compatibility with load order changes in BP 12.0 requires us to move to the system of registering BP_Group_Extension screens that was introduced in BP 2.1. This will require us to drop compatibility for versions older than that.

[boonebgorges]

These changes have been merged. Let's move forward with a limited 4.2.0 release so that we can beat BP 12.0 out the door.