[spec] simplified connections model

remove Connections belong to types
Connection details
[] space preview image doesn’t need types
Multiselct
[x] Color button replaces type button
[x] New connections Use last color bool (maybe nested inside settings like carddetails, if other settings?)
[x] connectionDetails
[x] Remove type list
[x] user.`shouldUseLastConnectionType` -> `shouldUseLastConnectionColor`
post migration 3
[] Remove connection . Typeid reference
[x] Filter button changes to filter by color (colored swatch to indicate)
[] remove associations from model
[] remove types table
[x] fix import / export
QA
[x] Update api docs. Removing types add connections attrs
[x] import json canvas file
[x] add support for migration for old file imports w connectiontypes
[x] prev anon user, open old hello space or inbox
[] Undo redo delete connection
[] Undo redo delete card w connections
[x] manual migration (normalize from types) on load localspace from cache
[[defferable]] fix draw canvas size. 1st horizontal line should be visible

remove Connections belong to types
Connection details
[] space preview image doesn’t need types
Multiselct
[x] Color button replaces type button
[x] New connections Use last color bool (maybe nested inside settings like carddetails, if other settings?)
[x] connectionDetails
[x] Remove type list
[x] user.`shouldUseLastConnectionType` -> `shouldUseLastConnectionColor`
post migration 3
[] Remove connection . Typeid reference
[x] Filter button changes to filter by color (colored swatch to indicate)
[] remove associations from model
[] remove types table
[x] fix import / export
QA
[x] Update api docs. Removing types add connections attrs
[x] import json canvas file
[x] add support for migration for old file imports w connectiontypes
[x] prev anon user, open old hello space or inbox
[] Undo redo delete connection
[] Undo redo delete card w connections
[x] manual migration (normalize from types) on load localspace from cache
[[defferable]] fix draw canvas size. 1st horizontal line should be visible