Implemented new button for commander window

Mods/vcmi/Sprites/buttons/commander.json

@@ -0,0 +1,8 @@
+{
+	"basepath" : "buttons/",
+	"images" :
+	[
+		{ "frame" : 0, "file" : "commanderNormal.png"},
+		{ "frame" : 1, "file" : "commanderPressed.png"}
+	]
+}

client/windows/CHeroWindow.cpp

@@ -117,7 +117,7 @@ CHeroWindow::CHeroWindow(const CGHeroInstance *hero):
 
 	if (hero->commander)
 	{
-		commanderButton = new CAdventureMapButton ("Commander", "Commander info", boost::bind(&CHeroWindow::commanderWindow, this), 317, 18, "chftke.def", SDLK_c, nullptr, false);
+		commanderButton = new CAdventureMapButton ("Commander", "Commander info", boost::bind(&CHeroWindow::commanderWindow, this), 317, 18, "buttons/commander", SDLK_c, nullptr, false);
 	}