[multiple] de-dup file and piped loggers (fixes #3101)

de-dup file and piped loggers for error logs and access logs

x-ref:
"RFE: de-dup file and piped loggers"
https://redmine.lighttpd.net/issu

[multiple] de-dup file and piped loggers (fixes #3101)

de-dup file and piped loggers for error logs and access logs

x-ref:
"RFE: de-dup file and piped loggers"
https://redmine.lighttpd.net/issues/3101

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[core] remove HANDLER_WAIT_FOR_FD

If a system call returns EMFILE, then admin should increase
server.max-fds and check/increase rlimits for num files (ulimit -Hn)

Alternatively, the admin might dec

[core] remove HANDLER_WAIT_FOR_FD

If a system call returns EMFILE, then admin should increase
server.max-fds and check/increase rlimits for num files (ulimit -Hn)

Alternatively, the admin might decrease server.max-connections to limit
the number of connections served in parallel.

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[core] remove HANDLER_UNSET enum value

[core] h2.[ch] with stub funcs (incomplete)

(subsequently incrementally updated using git rebase)

huge props and many thank yous to writers of testing tools used while
developing HTTP/2 support in

[core] h2.[ch] with stub funcs (incomplete)

(subsequently incrementally updated using git rebase)

huge props and many thank yous to writers of testing tools used while
developing HTTP/2 support in lighttpd:

h2spec - conformance testing tool for HTTP/2 implementation
https://github.com/summerwind/h2spec
h2load - HTTP/2 benchmarking tool
https://nghttp2.org/documentation/h2load-howto.html
curl - command line tool and library for transferring data with URLs
https://curl.haxx.se/

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[core] store (plugin *) in p->data

(self-referential)

[core] pass (request_st *) to request.c funcs

instead of (struct connection *)

[core] struct log_error_st for error logging

[core] pass (fdnode *) for registered fdevent fd

inline fdevent_fdnode_interest()
avoid array lookup for (fdnode *) for various ops

[core] some header cleanup

provide standard types in first.h instead of base.h
provide lighttpd types in base_decls.h instead of settings.h
reduce headers exposed by headers for core data structures

[core] some header cleanup

provide standard types in first.h instead of base.h
provide lighttpd types in base_decls.h instead of settings.h
reduce headers exposed by headers for core data structures
do not expose <pcre.h> or <stdlib.h> in headers
move stat_cache_entry to stat_cache.h
reduce use of "server.h" and "base.h" in headers

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[core] base_decls.h to quiet compiler warnings

quiet compiler warning for -Wtypedef-redefinition
(redefinition of typedef is a C11 feature)