flatpickr's internals have been cleaned up. Unused and unnecessary features have gotten removed, and the core is now lighter. Removed stuff may be revived later via plugins.

• Remove scrollwheel functionality
• Remove animated days
• formatDate() now accepts optional third argument for locale | #1226
• Fix header month/year being clipped in IE11 (#1235)
• Fix calendar not closing in IE11 | #1233
• Fix several rendering issues in IE11 and Edge (#1180)
• Add Italian rangeSeparator (#1239)
• altInput accessibility: use tabIndex from the original input element (#1246)
• Dates - disable sorting unless in range mode | #1243