IS: added IS-climate-change-basic-v10-old.nlogo

uses old interface for serializing data
Merge branch 'master' into inquiry-space
use more sane value for gravity, add clock
automatic index handling by rack dev server
add nocache headers in development mode

occasionally interactive files are cached by browsers
during development. Hopefully these nocache headers
will stop that from happening.
Implement dragging event handlers support

[#46991697]
Add a new interactive presenting .onDrag() function from Scripting API

[#46991697]
Merge branch 'inquiry-space'
initial version of 'external model'

the intention is to use this a sample for testing features
of a soon to be created iframe model type
Dispatch "layoutUpdated" event in InteractivesController

[#50996763]
Implement tooltips compatible with Lab semantic layout

[#50996763]

Resize tooltips dynamically + fix positioning.
Support tooltips in base InteractiveComponent class

[#50996763]
Fix tooltips positioning

[#50996763]
Add tooltips support to text component

[#50996763]
Add tooltips support to image component

 [#50996763]
Refactor button component, add tooltips support

[#50996763]
Add tooltips support to checkbox component

[#50996763]
Add tooltips support to pulldown, radio and slider components

[#50996763]
Add tooltips support to numeric output, graph and bar graph

[#50996763]
Support markdown syntax inside tooltips

[#50996763]