Add tools/convert_all_tga_to_png.bash

tools/convert_all_tga_to_png.bash

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+for name in ./*.tga
+do
+    convert "$name" "${name%.*}".png
+
+#    Slow and useless:
+#    optipng -o7 -zm1-9 "${name%.*}".png
+
+done