* change icons for autocorrect and select all toolbar keys by @codokie (#524, #651)
* add Chuvash layout by @tenextractor (#677)
* add cut toolbar key by @codokie (#678)
* update Probhat layout by @fahimscirex (#628)
* show toolbar icons in toolbar key dialog
* add close button in clipboard history by @codokie (#403, #649)
* add Russian (Student) layout by @Zolax9 (#640)
* make numpad on symbols key long press optional (#588)
* minor fixes and improvements, including #632, #637, #638 by @RHJihan
