APIs to remove in v7

[RDIL]

Hey all,

Opening this to suggest some redundant/problematic APIs we might want to get rid of in v7.

MasteryService#getMasteryDataForDestination

This API is literally identical to MasteryService#getMasteryData - it just forwards the call there. This seems pointless to have.

LogCategory#CALLER

Using arguments.caller is highly problematic, and doesn't even work in strict mode. It's also deprecated, see MDN.

Let me know what everyone thinks.

[AnthonyFuller]

The destination function was there for a reason as at one point it was different. I think maybe MVM removed the need for it though.