Added UI enhancements to non-gesture version (keys)
Added a preliminary gesture analyser based on vectors
Started on gestures implementation
Implemented calculation for infix input
Addition of cancel button, separation of parenthesis button
Changing application image, splashscreen, background image
Merge branch 'gestures'

* gestures:
  Changing application image, splashscreen, background image
  Started on gestures implementation Implemented calculation for infix input Addition of cancel button, separation of parenthesis button
  Added UI enhancements to non-gesture version (keys) Added a preliminary gesture analyser based on vectors