Added LM43603 voltage regulator

Created by: SchrodingersGat

LM43603 Voltage Regulator

Datasheet: http://www.ti.com/lit/ds/symlink/lm43603.pdf

Moved some pins on the left-hand side to better facilitate part placement. Based on the datasheet:

Footprint PR is outstanding - https://github.com/KiCad/kicad-footprints/pull/1585