consolidate AcceptXXXHeader classes into Accept #65

Job	Run time
Lint the package	36s
Build the documentation	29s
Validate coverage	29s
Python: 3.8-x64 on ubuntu-latest	30s
Python: 3.8-x64 on windows-latest	1m 28s
Python: 3.8-x86 on windows-latest	1m 29s
Python: 3.8-x64 on macos-latest	34s
Python: 3.9-x64 on ubuntu-latest	28s
Python: 3.9-x64 on windows-latest	1m 33s
Python: 3.9-x86 on windows-latest	1m 23s
Python: 3.9-x64 on macos-latest	30s
Python: 3.10-x64 on ubuntu-latest	26s
Python: 3.10-x64 on windows-latest	1m 19s
Python: 3.10-x86 on windows-latest	1m 30s
Python: 3.10-x64 on macos-latest	41s
Python: 3.11-x64 on ubuntu-latest	30s
Python: 3.11-x64 on windows-latest	1m 21s
Python: 3.11-x86 on windows-latest	1m 28s
Python: 3.11-x64 on macos-latest	32s
Python: 3.12-x64 on ubuntu-latest	29s
Python: 3.12-x64 on windows-latest	2m 2s
Python: 3.12-x86 on windows-latest	1m 44s
Python: 3.12-x64 on macos-latest	1m 11s
Python: pypy-3.8-x64 on ubuntu-latest	49s
Python: pypy-3.9-x64 on ubuntu-latest	49s
Python: pypy-3.10-x64 on ubuntu-latest	49s
Python: pypy-3.10-x64 on windows-latest	2m 3s
Python: pypy-3.10-x86 on windows-latest	1m 56s
Python: pypy-3.10-x64 on macos-latest	48s
	29m 56s

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