Convert local stars from lua to json

Note following comments could not be carried over:

- 44 Boötis B/C are a W-Ursae-Majoris-type shallow contact binary system,
  both G class,

- '40 Eridani' - Problem: the secondary and tertiary are co-orbital,
   and as a system orbit the primary.

- 'Mu Herculis' - Problem: the secondary and tertiary are co-orbital,
   and as a system orbit the primary.

- 'Alpha Centauri' - Comment: "Gliese 559", "FK5 538", "GC 19728",
   "CCDM J14396-6050"