This change replaces xpath_node_set single element storage with a
single-element array in hopes that this would silence Coverity false
positive about getting a singleton pointer.

Additionally, it refactors _assign member to unify small and large
buffer codepaths since they are basically identical.

Fixes #233 (hopefully)

Intel compiler by default sets flush-to-zero flags which causes our
denorm test to produce 0.0. So make sure that denorms work on FPU before
testing the string output.

Fixes #218.

Instead of hardcoding SOVERSION, use CMake variables to set it up.

Closes #220.

* Visual Studio Natvis visualization

* Changed string format to remove separate natvis file for wide character mode

* Display any node type with name and value if any of them are available

On some Debian systems it looks like we *can* open the current folder as
a file and read its contents, but parsing the result produces an empty
document. We now handle this case as well.

Fixes #225.

Fixes #224.

This makes sure the contents of tests/data/ folder does not go through
newline conversion, which breaks tests that rely on some files having LF
and some files having CR+LF.

Fixes #222.

It looks like zipfile module by default uses the permission mask 0,
which after unpacking on Unix-based systems leads to the files being
inaccessible.

We now explicitly set file mask to rw-r--r-- to match .tar.gz defaults.

Fixes #217.

- Up to now, the libdir was hardcoded to "lib" inside pugixml.pc and
  the install directory of pugixml.pc was "lib/pkgconfig"
- Adds support for lib and lib64 by using CMAKE_INSTALL_LIBDIR variable

This also bumps the minimum CMake version to 3.0 (from 2.8.12).

This is implicitly true due to the following section, but that was
written before C++11 so this does deserve a special mention in ranged
for section as well.

Fixes #210.

This setup can interfere with existing workflows in two ways:

- If the target application used CMake and configured custom postfixes,
this change would override them

- If the target application did *not* use CMake, it'd have to abide by
these conventions even if the target configuration used is unexpected -
for example, the default "preferred" configuration is frequently
RelWithDebugInfo, not Release, which now has a postfix.

Fixes #198.

This might have helped a bit with confusion in #195.

Add example code

We no longer need to specify the license boilerplate verbatim since we
have a separate file.

Also rename LICENSE to LICENSE.md

Also fix two http → https occurrences.

There's really never a reason to *not* want this installed. If an option
is needed to specify installing in a versioned subdirectory, this option
should be explicitly described rather than hidden in something else.

As an added bonus, this makes the CMake install code slightly *less*
complicated.

We need bad_alloc that lives in <new>, not <exception>.

pugixml.hpp wasn't including the <exception> header in this build but
test code needed it.

gcc-8 produces "attribute directive ignored" warning for
no_sanitize("unsigned-integer-overflow"); at some point gcc will
introduce integer sanitizer support and we'll have to do this all over
again but for now just don't emit the attribute.

Mention ubsan fixes; these fixes probably fix compact mode on some
64-bit architecture where unaligned pointer reads aren't valid as well
but it's probably not very relevant...

Several tests got the buffer size wrong when sizeof(char_t)>1, and one
test didn't meet the carefully tuned allocation criteria under compact
mode due to the hash table usage and had to be changed a bit.

We were using << compact_alignment_log2 instead of * compact_alignment
for symmetry with the encoding where >> is crucial to keep code fast and
round to negative infinity.

For decoding, the results are the same and any reasonable compiler
should convert *4 into <<2 so just use a multiplication - that doesn't
trigger UB on negative numbers.

We were using allocate_memory to allocate struct xml_extra_buffer that
contains pointers; with compact mode, this allocation can be misaligned
by 4b with 8b pointers; fix this by manually realigning the pointer.

We were misaligning document data on 64-bit platforms by placing 8b
pointers at 4b offsets; fix this by reserving a full pointer worth of
bytes for page marker.

Define noexcept using _MSC_VER instead of _MSC_FULL_VER (first release
of MSVC 2015 should have it), remove redundant PUGIXML_HAS_NOEXCEPT and
define PUGIXML_NOEXCEPT_IF_NOT_COMPACT in terms of PUGIXML_NOEXCEPT.

Still trying to decide if the next version should be 1.9 or 1.8x and
what other changes need to go in.

* Adds noexcept specifiers to the move special members of xml_document, but only #ifndef PUGIXML_COMPACT