api: tbtnc Sile now does all scripting with 0-based indexing
api: tbtnc Sile now does all scripting with 0-based indexing

This is to make it easily usable for scripters used to Python

Signed-off-by: Nick Papior <81a73bca3d342ffee33d7cf845fdbf77b6553831@gmail.com>

zerothi/sisl,zerothi/sisl