Bug 589707 - Flex .rule file for Visual Studio build can't cope with spaces in filenames

Adjusted the rules files and where and the vcproj file so it can handle paths with spaces as well.
When generating the documentation (Cygwin) a small problem appeared in a Makefile when there is a space in the path, this is solved as well.
Merge pull request #184 from albert-github/feature/bug_589707

Bug 589707 - Flex .rule file for Visual Studio build can't cope with spaces in filenames