(v1.5.5) Move to Typescript

Additions

• Test for adapter refetch functionality
• Test for shared context
• Documentation built with doccer

Changes

• Refactor all javascript files into TS
• Uniform context function for retrieving/adding minimally required attributes to adapter context
• Pre-populate defaults for optional and absolute 'Keywords'
• Add Tippy setting to README

Fixes

• Fix to function which registers snippet action menu item