introduced MANY changes from dropbox:

yorth.rb:
added recursive parser
reversed syntax (and added that to files)
strings no longer based on object
switched gets to readline
addded having callers to get parameters from
made varibles all YorthData
separated definition and assignment
added support (unused) for typing
fixed integer check
made all closures possibly drawn as blocks
added >, <, clear, lsp, let
fixed if

prelude.wye:
reversed syntax
added 'power'

added lambda.wye