New features: SVG, Term, side-tree and docstring-folding

There are many new extensions added since the project published:

• Pure-Lisp SVG rendering with LispWorks Graphics Port (lw-svg)
• Terminal Utilities for LispWorks, includes a functional Unix PTY running with the Editor, and a stream that can cope with ANSI escape sequences (term.lisp)
• A docstring folding facility, similar with definition folding(docstring-folding.lisp)
• Side Tree, a project explorer alternative to Treemacs (side-tree.lisp)

We hope they can be useful for you!~