Provide meaningful symbols for lambdas

[radrow]

Currently lambdas do not receive any names in the symbols field of the generated code. While this does not matter for normal development, it can be useful to identify them while in debug mode.

Proposal: fun#$(ParentFunName)#$(LineNumber)#$(ColumnNumber), eg

namespace Ns =
  function funkcja() = () => ()

would give the lambda the name fun#.Ns.funkcja#2#23