consolidate AcceptXXXHeader classes into Accept #61

Job	Run time
Build the documentation	35s
Validate coverage	37s
Lint the package	37s
Python: 3.8-x64 on ubuntu-latest	25s
Python: 3.8-x64 on windows-latest	1m 19s
Python: 3.8-x86 on windows-latest	1m 19s
Python: 3.8-x64 on macos-latest	49s
Python: 3.9-x64 on ubuntu-latest	25s
Python: 3.9-x64 on windows-latest	1m 10s
Python: 3.9-x86 on windows-latest	1m 35s
Python: 3.9-x64 on macos-latest	56s
Python: 3.10-x64 on ubuntu-latest	32s
Python: 3.10-x64 on windows-latest	1m 26s
Python: 3.10-x86 on windows-latest	1m 42s
Python: 3.10-x64 on macos-latest	36s
Python: 3.11-x64 on ubuntu-latest	23s
Python: 3.11-x64 on windows-latest	1m 33s
Python: 3.11-x86 on windows-latest	1m 38s
Python: 3.11-x64 on macos-latest	55s
Python: 3.12-x64 on ubuntu-latest	31s
Python: 3.12-x64 on windows-latest	1m 24s
Python: 3.12-x86 on windows-latest	1m 27s
Python: 3.12-x64 on macos-latest	38s
Python: pypy-3.8-x64 on ubuntu-latest	53s
Python: pypy-3.9-x64 on ubuntu-latest	54s
Python: pypy-3.10-x64 on ubuntu-latest	55s
Python: pypy-3.10-x64 on windows-latest	2m 16s
Python: pypy-3.10-x86 on windows-latest	2m 0s
Python: pypy-3.10-x64 on macos-latest	51s
	30m 21s

Provide feedback