consolidate AcceptXXXHeader classes into Accept #92

Job	Run time
Lint the package	36s
Build the documentation	31s
Validate coverage	34s
Python: 3.8-x64 on ubuntu-latest	30s
Python: 3.8-x64 on windows-latest	1m 11s
Python: 3.8-x86 on windows-latest	1m 22s
Python: 3.8-x64 on macos-latest	1m 3s
Python: 3.9-x64 on ubuntu-latest	28s
Python: 3.9-x64 on windows-latest	1m 22s
Python: 3.9-x86 on windows-latest	1m 31s
Python: 3.9-x64 on macos-latest	47s
Python: 3.10-x64 on ubuntu-latest	29s
Python: 3.10-x64 on windows-latest	1m 24s
Python: 3.10-x86 on windows-latest	1m 33s
Python: 3.10-x64 on macos-latest	35s
Python: 3.11-x64 on ubuntu-latest	31s
Python: 3.11-x64 on windows-latest	1m 29s
Python: 3.11-x86 on windows-latest	1m 29s
Python: 3.11-x64 on macos-latest	36s
Python: 3.12-x64 on ubuntu-latest	35s
Python: 3.12-x64 on windows-latest	1m 22s
Python: 3.12-x86 on windows-latest	1m 36s
Python: 3.12-x64 on macos-latest	46s
Python: pypy-3.8-x64 on ubuntu-latest	53s
Python: pypy-3.9-x64 on ubuntu-latest	59s
Python: pypy-3.10-x64 on ubuntu-latest	54s
Python: pypy-3.10-x64 on windows-latest	2m 8s
Python: pypy-3.10-x86 on windows-latest	1m 59s
Python: pypy-3.10-x64 on macos-latest	57s
	30m 10s

Provide feedback