New image functions:

* invert
 * flip_horizontal
 * flip_vertical
 * rotate

git-svn-id: svn://svn.code.sf.net/p/magicseteditor/code/trunk@1472 0fc631ac-6414-0410-93d0-97cfa31319b6

doc/function/invert.txt

@@ -0,0 +1,14 @@
+Function: invert
+
+--Usage--
+> invert(input: image)
+
+Invert the colors in an image.
+
+--Parameters--
+! Parameter	Type			Description
+| @input@	[[type:image]]		Image to invert.
+
+--Examples--
+> invert("image_logo.png")  ==  [[Image]]
+>>> invert(<img src="image_logo.png" alt='"image_logo.png"' style="border:1px solid black;vertical-align:middle;margin:1px;" />) == <img src="image_logo_invert.png" alt='"image_logo_invert.png"' style="border:1px solid black;vertical-align:middle;margin:1px;" />