built in names for points and the type of in empty space

[DrCatman]

built in names for:

• [ ] empty space
• [ ] point in empty space
• [ ] point in empty space type

Tasks

• [ ] research on usability and consequence
• [ ] implementation

Stemming from #54

notes

• class of that shape
• instance of that shape
• set of instances of that shape

[emanuellima1]

Impl: a bultin empty point for the user to import