v2.0.0-beta.3

Additions

• Calendar interface (#241)
• Code interface (#243, #255)
• Add button group interface (#248)
• Add color picker interface (#249)
• Add example page extension (#252)
• Add icon picker interface (#253)
• Add toggle icon interface (#254)

Changes

• Throw item not found when fetching a single item instead of read permission denied (6480f33, 6ac3d28)
• Fix casting system data types (ccc02ac)
• Fix enforce read permission (9a26e7f)
• Update default upload path: (8f2cc30)
• Update Input/Output tests: (3a9284a, 09ec2f4, 5976b69)