OpenBoard new 1.4.5 v18

Changes since v18:

• use internal settings for editing the (system) personal dictionary, by @BlackyHawky (#322)
• add Gujarati layout (#417)
• add home, end and select word toolbar keys
• fix scrollbar placement for tool bar on some devices, by @arcarum (#411, #354)
  • may change scrollbar color on tool bar
• fix accented letters not showing up for upper case (#397 and a bunch of duplicates)
• fix dialog behavior, by @arcarum (#420, #413)
• remove spoken key descriptions for emojis and accented letters, should be handled by TTS instead of the keyboard
• some more small fixes and improvements