devel/monodevelop: update to 7.5.3.7

• remove reference assemblies as a dependency: no longer required
• remove mono-addins as a dependency: shipped internally (via github)
• remove cmake as a dependency: replaced by new build system based on msbuild
• add multiple nuget feeds and move nuget dependencies into separate files
• explicitly set full path to install(1) to fix installation script
• USES=mono: read nupkg name and version from nuspec file

Differential Revision: https://reviews.freebsd.org/D16070