* replace Git tarball by upstream release tarball
* use proper SONAME (libxpp-0_2_0 wasn't the SONAME, now it is libxpp-3)
* minor changes in the code:
- consistently marm move ctors and operators as noexcept
- improvements in the build system
- use new libcosmos dependency
OBS-URL: https://build.opensuse.org/package/show/X11:XOrg/libxpp?expand=0&rev=14
* buildsystem: use single quotes throughout
* python files: flake8 fixes
* gitignore: ignore all build trees
* buildsystem: support not building docs
* SConstruct: use new helper method to pull in libcosmos
* XWindow: also export utf8_string getter
* XCursor: support defining a cursor from pixmap data
* Pixmap: support creating Pixmap from in-memory bitmap data
OBS-URL: https://build.opensuse.org/package/show/X11:XOrg/libxpp?expand=0&rev=6
