V5.4: Fixed communication problem

• Fixed the communicating problem with the Kiss FC
• New welcome screen
  • Removed the old "Do not arm. Please wait"-Message
• Huge memory saving
  • Lot of free Memory for future functions
  • RAM usage went from 75% to 50%
  • Flash usage went from about 80% to 65% when compiled with Arduino
  • I made some changes in calculating the displayed values. For now for example the current consumption of one ESC is shown as 13.2 A and the temp has no °-sign. I will fix this design-problem in a future release.

##I could not fully test this release during flight (problems with my Quad) , but static testing without Props worked.