Support "0" line AKA numbered title line

[cprosche]

Some TLEs can have a title line that starts with zero.

Example:

0 ISS (ZARYA)
1 25544U 98067A   08264.51782528 -.00002182  00000-0 -11606-4 0  2927
2 25544  51.6416 247.4627 0006703 130.5360 325.0288 15.72125391563537

Add parser support for this format.