consolidate AcceptXXXHeader classes into Accept #80

Job	Run time
Lint the package	24s
Build the documentation	26s
Validate coverage	30s
Python: 3.8-x64 on ubuntu-latest	28s
Python: 3.8-x64 on windows-latest	1m 20s
Python: 3.8-x86 on windows-latest	1m 31s
Python: 3.8-x64 on macos-latest	47s
Python: 3.9-x64 on ubuntu-latest	27s
Python: 3.9-x64 on windows-latest	1m 16s
Python: 3.9-x86 on windows-latest	1m 28s
Python: 3.9-x64 on macos-latest	1m 27s
Python: 3.10-x64 on ubuntu-latest	28s
Python: 3.10-x64 on windows-latest	1m 29s
Python: 3.10-x86 on windows-latest	1m 38s
Python: 3.10-x64 on macos-latest	36s
Python: 3.11-x64 on ubuntu-latest	25s
Python: 3.11-x64 on windows-latest	1m 19s
Python: 3.11-x86 on windows-latest	1m 29s
Python: 3.11-x64 on macos-latest	1m 0s
Python: 3.12-x64 on ubuntu-latest	33s
Python: 3.12-x64 on windows-latest	1m 31s
Python: 3.12-x86 on windows-latest	1m 37s
Python: 3.12-x64 on macos-latest	44s
Python: pypy-3.8-x64 on ubuntu-latest	47s
Python: pypy-3.9-x64 on ubuntu-latest	51s
Python: pypy-3.10-x64 on ubuntu-latest	54s
Python: pypy-3.10-x64 on windows-latest	2m 15s
Python: pypy-3.10-x86 on windows-latest	1m 56s
Python: pypy-3.10-x64 on macos-latest	52s
	30m 28s

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