add BLTouch-related messages in english and (rusty) french;
add missing endstops.h in ultralcd.cpp;
fix misc. compiler warnings;
fix lsf_reset - ZERO macro can't handle a pointer as it would only memset the size of the pointer, not the size of the entire struct
Add U8glib as a dependency to platformio.ini for those who use PlatformIO; this makes compiling even easier as u8glib will be downloaded and included automatically.
Also added the new .pio-related directory to .gitignore, and a few ignores for those who use cmake.