v0.8.901

!!! a full update with Sketch data upload is required. After updating please press CTRL+F5 in browser !!!
Please backup playlist.csv and wifi.csv before updating.

• added SD Card support (more info in connection table and exsamples/myoptions.h)
• added MODE button to switch SD/WEB modes (more info in Controls.md)
• asterisk on the remote control now switches SD/WEB modes
• double click BTN_CENTER and ENC_BTNB now toggles SD/WEB modes
• bug fixes