mini-dome greenhouse

Remix of obijuan's excellent Mini-Dome scad code:
https://www.thingiverse.com/thing:26860
(Unfortunately thingiverse' remix search doesn't work, or I can't get it to work)

Everything in scad format:
- Added holes to connectors that scale with the connectors.
-- Good for the following:
---- Saving on filament.
---- Using for foil anchor when using dome as greenhouse.
---- Makes it easy to see if the sticks are fully in the connector holes/
---- Added benefit of looking pretty.
- Added feet connectors.
- Added clamp connector to clamp foil to the feet connectors.
- Added stick generation.
- is_hex_connector_perpindicular can be used to make sticks perpindicular to mini_dome_hexa and mini_dome_penta.
- Only shared_variables.scad need modifiy for different stick lengths, diameters, etc and documentation in the scad code.
- Little script for calculating dome height from given diameter incase anything happens to https://simplydifferently.org/Geodesic_Dome_Notes?page=3#2V/L