Added LM2596

schematics/power/regulators.dcm

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+EESchema-DOCLIB  Version 2.0
+#
+$CMP LM2596
+D LM2596 SIMPLE SWITCHER ® Power Converter 150 kHz 3A Step-Down Voltage Regulator
+K Buck Step-down regulator
+F http://www.ti.com/lit/ds/symlink/lm2596.pdf
+$ENDCMP
+#
+#End Doc Library

schematics/power/regulators.lib

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+EESchema-LIBRARY Version 2.3
+#encoding utf-8
+#
+# LM2596
+#
+DEF LM2596 U 0 40 Y Y 1 F N
+F0 "U" -250 350 60 H V C CNN
+F1 "LM2596" 150 350 60 H V C CNN
+F2 "" -50 200 60 H V C CNN
+F3 "" -50 200 60 H V C CNN
+$FPLIST
+ DDPAK
+ TO-263
+$ENDFPLIST
+DRAW
+S -300 300 300 -300 0 1 0 f
+X VIN 1 -500 100 200 R 50 50 1 1 W
+X Output 2 500 0 200 L 50 50 1 1 w
+X GND 3 200 -500 200 U 50 50 1 1 W
+X Feedback 4 500 200 200 L 50 50 1 1 I
+X ON 5 -150 -500 200 U 50 50 1 1 I I
+ENDDRAW
+ENDDEF
+#
+#End Library