Paladin: Refactor stopattack UI options + add manually triggered attacks as an experimental feature for prot

[wsphillips]

Protection paladins can force extra attacks gained via Reckoning to be stored until the next melee swing by manually triggering each melee swing when the swing timer is ready. By using a stopattack/@target macro on rotational abilities, we can also store WS/HoJ/etc procs gained between melee swings.

This PR adds an experimental option to simulate doing the above with perfect accuracy/timing. While possible in game (confirmed on PTR), this is difficult to do in practice and DPS gains in simulations with this feature enabled are informative but potentially misleading. Simply put: it's unlikely that even the sweatiest of prot paladins will be able to do it perfectly throughout an entire encounter, and missing the timings can have detrimental effects on DPS. As such, I have put it behind the Show Experimental option and added a simulator warning that turns on when the feature is enabled.

Nonetheless, simulating manually triggered autoattacks with slow 1H weapons yields a ~10-20% DPS increase, so I think it's worth having the option for advanced users to see the potential gains in an idealized setting.

This PR also includes some refactoring of how stopattack macros get saved and processed in the paladin spec options. It uses a bit mask + bit-shifted spell codes to make the code simpler for both protection and retribution paladins.

[wsphillips]

We don't need to duplicate these spec options into the Protection/Retribution structs. They're all already in the regular Options field of the paladin struct. I left primarySeal just in case, but removed the affected fields here and in the RetributionPaladin struct.