v6.6.0

ModelingToolkit v6.6.0

Diff since v6.5.2

Closed issues:

• propertynames errors for system with array variable (#1202)
• Add ability to customize the name of the system generated by modelingtoolkitize (#1276)
• Unbalanced System (# of equations, # of variables) (#1284)

Merged pull requests:

• add nicer discrete sys -> prob constructor (#1268) (@anandijain)
• Add connection_type to DiscreteSystem (#1272) (@ven-k)
• add isvariable for Nums (#1289) (@isaacsas)
• CompatHelper: bump compat for JuliaFormatter to 0.17, (keep existing compat) (#1290) (@github-actions[bot])
• Drop extraneous line in varmap_to_vars (#1292) (@isaacsas)