Multi-request publishing workflow

• Added new multi-request publishing workflow.
• Fixed default permissions on Docker volumes.
• FreeBSD platform names are now nicely displayed on the HTML builds page.

v2.1.0

• Added PathBase config option to allow hosting Robust.Cdn behind a subpath.

v2.0.2

• Fixed /version/* compatibility paths not working correctly.

v2.0.1

• Fixed compiled version number on binaries.

v2.0.0

• Added multi-fork support.
• Added server manifest management & direct publishing system.
• Please refer to the documentation for migration guide.
• Many internal changes.
• Start of Robust.Cdn.Lib and Robust.Cdn.Downloader projects. These are still unstable for the time being.