new compile option NANO=YES triggers usage of newlib-nano when linking ARM code.
Fixes #1538: Lua playFile(): current language sound path added to the file name in case of a relative path
Fixes #1540: added Lua playDuration()
(reverted from commit fd3790519a1acc46355f35e32ad88a426d46aa90) newlib-nano on my comp has a malloc/free bug, memory gets used but not freed
Fixes #1532: added Lua playTone()
Merge pull request #1597 from opentx/projectkk2glider/lua_new_features

Projectkk2glider/lua new features