object: new object API and add NULL support for variants #148

Job	Run time
CentOS 7 build to confirm no issues once used downstream	1m 1s
Build sources on arm64 for ubuntu-latest - gcc	2m 55s
Debian Buster build to confirm no issues once used downstream	7m 22s
Build sources on arm64 for ubuntu-latest - clang	2m 34s
Build sources on MSYS2 for windows-latest	1m 41s
Build sources on MSYS2 for windows-2019	1m 40s
Build sources on amd64 for windows-latest	15s
Build sources on amd64 for windows-2019	57s
Build with various code analysis tools (clang-sanitize-address)	22s
Build sources on amd64 for ubuntu-latest - gcc	20s
Build with various code analysis tools (clang-sanitize-memory)	23s
Build sources on amd64 for ubuntu-latest - clang	10s
Build with various code analysis tools (clang-sanitize-undefined)	23s
Build sources on amd64 for macos-latest - gcc	17s
Build with various code analysis tools (clang-sanitize-dataflow)	23s
Build sources on amd64 for macos-latest - clang	15s
Build with various code analysis tools (clang-sanitize-safe-stack)	19s
Build with various code analysis tools (valgrind)	2m 43s
	24m 0s

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