GT-3430 - Key Bindings - Updated the Function Call Trees Plugin's

actions key bindings so users can set the bindings separately

Ghidra/Framework/Generic/certification.manifest

@@ -49,6 +49,7 @@ src/main/resources/images/face-monkey16.png||Tango Icons - Public Domain|||origi
 src/main/resources/images/flag.png||Oxygen Icons - LGPL 3.0|||Oxygen icon theme (dual license; LGPL or CC-SA-3.0)|END|
 src/main/resources/images/greenDragon16.png||GHIDRA||||END|
 src/main/resources/images/greenDragon24.png||GHIDRA||||END|
+src/main/resources/images/help-browser.png||Tango Icons - Public Domain|||tango icon set|END|
 src/main/resources/images/internet-web-browser16.png||Tango Icons - Public Domain|||originally internet-web-browser.png from tango|END|
 src/main/resources/images/kgpg.png||Nuvola Icons - LGPL 2.1|||Nuvola icon set|END|
 src/main/resources/images/mergemgr16.gif||GHIDRA||||END|

Ghidra/Framework/Generic/src/main/java/resources/Icons.java

@@ -35,6 +35,9 @@ public class Icons {
 
 	public static final ImageIcon EMPTY_ICON = ResourceManager.loadImage("images/EmptyIcon16.gif");
 
+	public static final ImageIcon HELP_ICON =
+		ResourceManager.loadImage("images/help-browser.png");
+
 	public static final ImageIcon ADD_ICON = ResourceManager.loadImage("images/Plus2.png");
 
 	public static final ImageIcon COLLAPSE_ALL_ICON =
@@ -82,7 +85,7 @@ public class Icons {
 		new DotDotDotIcon(ResourceManager.loadImage("images/Disk.png")));
 
 	public static final ImageIcon MAKE_SELECTION_ICON =
-		ResourceManager.getImageIcon(ResourceManager.loadImage("images/text_align_justify.png"));
+		ResourceManager.loadImage("images/text_align_justify.png");
 
 	// Not necessarily re-usable, but this is needed for the help system; these should 
 	// probably be moved to the client that uses them, while updating the