* Cast from float explicitly.
* Upgrades to waf 2.0.2.
For VS2017 support on Windows.
* [waf] Supports building on Windows.
Needs 7z.exe in PATH for extracting prebuilt clang NSIS installer (when
using bundled clang).
RPATH is "emulated" by putting a libclang.dll alongside the cquery
binary.
Tested with Visual Studio 2017 toolchain.
* [waf] Fix default_resource_directory on Windows + system clang.
* Add AppVeyor configuration
