target_link_libraries/INTERFACE doesn't seem to work on CMake 3.10, but
directly setting the property does work.

Fixes #390.

cmake: avoid ALIAS target

This is not allowed on IMPORTED targets.

Update 1.11 release notes

For users using older pugixml releases, add an ALIAS target which works
with the new versions too.

The changes are mostly mechanically converting str to bytes.

The logo.svg link is dead anyway.

Update version to 1.11 and update documentation

One more XPath test falls prey to MSVC6 NaN comparison codegen issues.

child variable was shadowing xml_node::child

Fix MSVC deprecation warnings when using clang-cl

We now use open_file similarly to open_file_wide, and activate the
workaround for MSVC 2005+ since that's when the _s versions were added
in the first place.

Added fix to pugixml_dll.rc so shared lib can be built with MinGW

XPath: Fix stack overflow in functions with long argument lists

Function call arguments are stored in a list which is processed
recursively during optimize(). We now limit the depth of this construct
as well to make sure optimize() doesn't run out of stack space.

XPath: Restrict AST depth to prevent stack overflow

The default stack on MSVC/x64/debug is sufficient for 1692 nested
invocations only, whereas on clang/linux it's ~8K...

For now set the limit to be conservative.

XPath parser and execution engine isn't stackless; the depth of the
query controls the amount of C stack space required.

This change instruments places in the parser where the control flow can
recurse, requiring too much C stack space to produce an AST, or where a
stackless parse is used to produce arbitrarily deep AST which will
create issues for downstream processing.

As a result XPath parser should now be fuzz safe for malicious inputs.

Fix debug postfix in pkgconfig file

In case of USE_POSTFIX, the POSTFIX is dependent
on the CMAKE_BUILD_TYPE.
Use the correct POSTFIX also in the generated pugixml.pc file.

This results in the following contents of pugixml.pc:
- Release:
  Libs: -L${libdir} -lpugixml
- RelWithDebInfo
  Libs: -L${libdir} -lpugixml_r
- MinSizeRel:
  Libs: -L${libdir} -lpugixml_m
- Debug:
  Libs: -L${libdir} -lpugixml_d

[Cmake] Static build should not export APIs

Fix PowerShell errors on stderr

PS invocation of code coverage upload gets triggered because of stderr
output from curl with progress report when uploading coverage.

Fixes #359

In some MSVC versions on x64 configurations, the hashing function
triggers this failure:

Run-Time Check Failure #1 - A cast to a smaller data type has caused a
loss of data.  If this was intentional, you should mask the source of
the cast with the appropriate bitmask.

This is similar to the integer sanitizer - this code is valid C++ but
MSVC decides to warn about this nonetheless. Masking the pointer's low
32 bits fixes the issue.

Fixes #357.

Use nullptr in pugixml.hpp if available, see #91

pugixml currently unconditionally accepts documents with multiple
top-level element nodes in absence of parse_fragment. This is an
unfortunate omission; while it can be corrected, it will result in
regressions for some users, and it's trivial to perform the validity
check after the parse is done.

Because of this, for now we're just going to amend documentation here to
both highlight this in the W3C Conformance section, but also to more
strongly push users into realizing that there's just a single document
element (normally).

We might decide to change the behavior here to prohibit such documents
by default in the future, but for now a documentation change seems like
a better tradeoff.

Fixes #337

Various CMake improvements

This will allow projects to use pugixml from its build directory
rather than having to install it.

Add "Include pugixml.cpp" and "Header Only" linkage options

The old logic for BUILD_SHARED_LIBS and BUILD_SHARED_AND_STATIC_LIBS
would produce two targets with the same name and different build
rules. The Makefile generator tolerated this, but the Ninja generator
raised an error. Fix the logic so that only one shared and one static
target gets built, and make the pugixml target an ALIAS of the one
dictated by BUILD_SHARED_LIBS.