33539cb34b Extract MakeUnique into utilmemory.h (Ben Woosley)
Pull request description:
And use it to reduce chainparamsbase.cpp's and remove interfaces/handler.cpp's reliance on util.h
This is a step toward fixing the chainparamsbase -> util circular dependency.
Confirmed no need for the util.h include via iwyu and visual inspection.
Extracted from #13639 for easier review.
Tree-SHA512: 61cbf9eafb68c3e3706d21c70aeb0586a85364dad32cc49c2d40e963ac3b2c44424ad1522788a0a6b2a689fd9294ebce4482a392ceb88a94eabe09a84f070ce4
