the way we learned to do it back in the 1950'ies.

Until now, VCC has used sort of a massaged C-expression and with
the introduction of things like regexp matching and ACLs that turned
sort of ugly.

This code is classic recursive expression parsing with a couple of
twists:

1. We don't build a tree, because we are not going to optimize stuff,
   we leave that to the C compiler.

2. Instead of the tree we build a string with magic markers that
   let us get the indentation of the produced C code right anyway.

3. We do type-hinted parsing, in an attempt to produce intelligent
   error messages and sensible semantics.

This code passes all testcases with a single change:  We can now
compile "if (2 == 3)".  This is probably a good thing (?)

Beware of bugs...




git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@5130 d4fa192b-c00b-0410-8231-f00ffab90ce4