Flight data recorder open file in append mode, not resetting old one.
Disable baro altitude only if difference from hgps is over 100m , when the baro altitude is steady while hgps is changing. This is fixing a problem with baro instruments on ground, where the hgps is floating and baro is steady.
Fix clock overlay in 480x640
Implemented projection of future positions in 2, 5 and 10 min on heading line
Do the baro altitude check for steadyness only airborne, not on ground
Merge branch 'v50' of https://github.com/alus-/LK8000 into new
Add internal AlphaBlend Function for All device
Screen orientation, save OS orientation on startup and restore it on shutdown.
  this is needed for allow use landscape mode with Oudie 2 device.