Changelog of @hackage/cake3 0.5.1.0

Version 0.5.1.0

Fix urembed tool, change UrWeb.bin API, converts url's from the CSS to Ur/Web format

Autobuild 'clean' rule. genFile and genTmpFile functions allowing to embed text files into the Makefile.

API changes, improve documentation, improve UrWeb extension

Redesign (simplify) monadic interface, add support for prebuild/postbuild actions.

Initial release