Setting this flag outputs start and end tag for every element, including empty
elements.

Fixes #118.

Split some lines into two and add braces in some places to make the code more
readable.

This keeps all code that creates document/allocator/page structures together.

The separate copy of allocator state in parser was meant to increase parsing
performance by reducing aliasing/indirection, but benchmarks against the
current source don't indicate that this is worthwhile.

Removing this simplifies the code slightly and makes it possible to move
compact hash table to the allocator.

Some compilers support move semantics but don't support ranged for.

MSVC 2010 supported move semantics (partially - but should be good enough for
our use case).

Do it in one place and set PUGIXML_HAS_MOVE if it's available.

VS 2013 supports C++11, but __cplusplus macro isn't updated, and it is 199711 so the old check always fails, even though the compiler supports c++11.

Add C++11 'override' specifier

docs: Fix broken link at quickstart page

Select correct suffix to use for pkg-config

Merge USEOWNSUBDIR and PKGCONFIG build flags; move the pkg-config source file
to scripts/.

Also creating a separate install directory under INCLUDE and LIB directories

Remove static pivot from NuGet autopkg.

This pivot seemed to be causing issues because the NuGet package thought it was actually dynamic.

scripts: Add VS2013 static builds to nuget package

Include more configurations in the Nuget package.

It interferes in a somewhat strange way with codecov reporting

While I grew to dislike references for this case, there are other functions in
the source that use references so switch to that for consistency.

This adds about 40 cycles for parsing <?xml version='1.0'?> declaration and
about 70 cycles for parsing <?xml version='1.0' encoding='utf-8'?>, as
measured on a Core i7, which should be negligible for all documents.

Fixes #16.

It is probably redundant given that we have -Wold-style-cast, but it's better
to warn about casts like this in case we ever need to remove the latter flag.

Fixes #99.