New footprints, edit schmatic symbol

Fooprints:
* SOIC-20W_ThermalPad
* ALPS Stereo Poti
* Lumberg THT Audio Jack

Schmeatic:
* Change TPA6120 in TI lib: add thermal pad as pin

schematics/ti/ti.lib

@@ -272,6 +272,7 @@ X LVCC+ 3 -200 -100 200 R 50 50 1 1 W
 X LIN+ 4 -200 -400 200 R 50 50 1 1 I
 X LIN- 5 -200 -500 200 R 50 50 1 1 I
 X RVCC- 20 950 -200 200 L 50 50 1 1 W
+X PAD 21 400 -1150 200 U 50 50 1 1 I
 X RIN- 16 -200 -900 200 R 50 50 1 1 I
 X RIN+ 17 -200 -800 200 R 50 50 1 1 I
 X RVCC+ 18 -200 -200 200 R 50 50 1 1 W