General firmware and camflasher improvements

CamFlasher modification :

• Underline escape sequence
• Add the injection of the shell into raspberry pico pi from pycameresp github
• Size of output in the title
• Default color changed
  PyCameresp firmware :
• Increase in text editor performance
• Removal of potential sd corruption
• Fix images corrupted by wifi disturbances
• Improved motion detection performance