orlyi: Make JumpRunnable catch and rethrow exceptions

Previously it just let them fly by and straight into the fiber
schedule which would result in badness.
util/error.test: Disable the interrupt test because it sometimes gets stuck forever.
base/fd: Move a utility function (Read a file into a string) into fd.h
base: Add function to convert items which have ostream printers to strings.
orlyi websockets: Add a get_source command to grab the source code of a compiled package.
websockets: Always return valid json

This changes the websockets layer to always build a TJson object
rather than the mix of hand formatting we had before. Forces
correctness in terms of emitted JSON.
jhm: Always cleanup the status line / make it live when a test fails.
Removed uses of gcc internal, std::_Tuple_impl and updated Base::Join.
Provided Concat which is equivalent to Join(container, "").
Don't insert  since it results in a '\0' being inserted.
Use <jhm/naming> properly so you don't have to end PackageDir with a '/'