Flexelint comments are mandatory, and must bracket all content
after the initial block comment.

Macros can either be single line "FOO(....)\n" or multiple line
"FOO(...\n)\n\n"

Any macros defined or called must be #undef'ed by the include/tbl file

include/tbl/style.py checks this.

so that our compiled VCLs are certain to restart/reload even if
the VMOD package has been updated in the meantime.

Fixes: #2041

Spotted by:	dridi

Fixes:	#2175

Fixes: #1750

make it work more like people would expect.

Fixes #1991

die until we have started the child process.

what our job is and how we will structure processes for it, before
doing all the complex stuff.

startup situation.

Example for the case addressed here is an html comment which is not esi.

	1st call on !--e
	2nd call on !--end

The first call could match !--esi:, so vep_match() does not return with
VEP_NOTMYTAG, but with null, so characters up until 'e' are marked.

For the second call, we need to consider the case that characters after
the end of the tag could already be marked.

Fixes #1988

ESI Debugging code is disabled unless the Debug macro at the top of the file is changed.

it is the place which defines
VMB_NEEDS_PTHREAD_WORKAROUND_THIS_IS_BAD_FOR_PERFORMANCE

cache.h before system includes to avoid duplicate include warnings
- except for stddef.h, which should come before cache.h to avoid warnings on
  Linux/gcc
some reordering for the same reason
remove some unused includes
misc cleanup

Still incomplete

Info 793: ANSI/ISO limit of 31 'significant characters in an external
    identifier', '__pthread_unregister_cancel_restore(struct
    __pthread_unwind_buf_t *)', exceeded -- processing is unaffected
Info 793: ANSI/ISO limit of 31 'significant characters in an external
    identifier', 'pthread_mutexattr_getprioceiling(const union
    pthread_mutexattr_t *, int *)', exceeded -- processing is unaffected
Info 793: ANSI/ISO limit of 31 'significant characters in an external
    identifier', 'pthread_mutexattr_setprioceiling(union pthread_mutexattr_t *,
    int)', exceeded -- processing is unaffected

duplicate includes via cache.h and common.h

export missing VSB symbols from libvarnishapi