Fix PUGIXML_VERSION macro

Also make sure the line shows up in grep when using the current version
number.

Fixes zeux#478.

docs: Regenerate HTML documentation

docs: Regenerate HTML documentation

Merge pull request zeux#394 from zeux/cmake-yay

Don't define pugixml import target if it already exists

Merge pull request zeux#391 from zeux/cmake-omg

Fix compatibility issue with CMake 3.10

Merge pull request zeux#389 from mathstuf/fix-alias-compat-target

cmake: avoid ALIAS target

docs: Rebuild HTML documentation

scripts: Convert archive.py to Python 3

The changes are mostly mechanically converting str to bytes.

docs: Update documentation for 1.10 release

Update changelog and regenerate HTML documentation.

tests: Fix PUGIXML_COMPACT build on some platforms

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