HLGA-6 footprint added
Added footprint HLGA-6 for sensor audio. Datasheet: http://www.st.com/content/ccc/resource/technical/document/datasheet/group3/27/62/48/98/44/54/4d/36/DM00303211/files/DM00303211.pdf/jcr:content/translations/en.DM00303211.pdf
PR packages3D: https://github.com/KiCad/kicad-packages3D/pull/231 PR packages3D-source: https://github.com/KiCad/kicad-packages3D-source/pull/88