HeliBoard 4.3-beta1

Changes since HeliBoard 4.2:

• add option to select words instead of letters when delete-swiping
  • comes with internal changes how words are handled, look out for new bugs even if you don't use this setting
• add option to only show the first instance of a word in gesture data review screen (#2891)
• add / enable KeyCode.DELETE_WORD (-8)
• improve import of .combined dictionary files
• reduce unwanted addition of words to typed history
• fix split keyboad not working (#2882)
• increase limit for recent emojis