Clean up apache2handler SAPI.

Key improvements:
- Be streamy
- Re-enable virtual() support
- Set content_type correctly
- Remove unnecessary code and reintroduce some missing

Clean up apache2handler SAPI.

Key improvements:
- Be streamy
- Re-enable virtual() support
- Set content_type correctly
- Remove unnecessary code and reintroduce some missing code
- Change signature from PhP to PHP

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initial checkin of the apache2 SAPI using a handler instead of filters.
TBD: src highlighting
better post handling