life: Rename :lwss to :lightweight-space-ship

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>
quil: simplify add-form

Make add-form a shortcut to add forms from life/forms, instead of
having an option to add arbitrary ones too.

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>
quil: Further add-form changes

Teach add-form to be able to place forms at a given offset, and return
meaningful results (used only in LightTable).

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>
life: Added a few more interesting forms

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>
playground: New things to play with

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>