* changes:
Remove AccountGroupById and AccountGroupMember
Flatten group audit keys into containing types
Rename AccountGroupByIdAud to AccountGroupByIdAudit
Rename group audit methods to remove get prefix
Convert account audit types to AutoValue
Group audits: Convert nullable methods to Optional
AccountLoader: Mark methods and args as nullable
Rename PatchSetApproval methods
Convert PatchSetApproval to AutoValue
ChangeNotesParser: Replace ApprovalKey with PatchSetApproval.Key
PatchSetApproval: Convert getTag to return Optional
PatchSetApproval: Add setValue(int) convenience method
PatchSetApproval: Replace copy constructors with instance methods
Rename PatchSet methods
Convert PatchSet to AutoValue with builder
PatchSet: Rewrite splitGroups/joinGroups
33e7081a25