Allow /alliance to automatically become /party when in a Light Party or Full Party, or at least still display (rather than just giving an error).

Currently, there are some announcement macros that I want everyone in the instance to be able to see. If I use /a, it gives an error in Light/Full Party. If I use /p, it only displays to 1/3rd of the raid in 24-player content. And if I use /a and /p, it gives double-spam to my personal Alliance in 24-player content.

It would be cleaner if /a just became /p when the content is Light/Full, or if /a just always worked (even in Light/Full instances).

Oddly, it already does this in Frontlines: macros with announcements written in /a still work in 24-player Frontline (despite having only one allied Full Party).