Batch of Bugfixes

-=-=-=-=-=-=-=-=-

-Fixed Export UV XForm (should work now). #923
-Fixed enforcement of limits in property editor. #919
-Fixed long-standing bug of export editings in script inheritance. #914, #859, #756
-Fixed horrible error reporting in shader language. #912
-Added kinematic collision with plane (please test well). #911
-Fixed double animation track insert when using 2D rigs. #904
-VKey updates offset parameter in sprite edition. #901
-Do not allow anymore a script to preload itself. (does not fix #899, but narrows it down)
-Avoid connection editor from overriding selected text. #897
-Fixed timer autostart. #876
-Fixed collision layers in 3D physics. #872
-Improved operators in shader #857
-Fixed ambient lighting bug #834
-Avoid editor from processing gamepad input #813
-Added not keyword #752

Please test!

scene/gui/tree.cpp

@@ -1693,6 +1693,13 @@ void Tree::text_editor_enter(String p_text) {
 		case TreeItem::CELL_MODE_RANGE: {
 
 			c.val=p_text.to_double();
+			if (c.step>0)
+				c.val=Math::stepify(c.val,c.step);
+			if (c.val<c.min)
+				c.val=c.min;
+			else if (c.val>c.max)
+				c.val=c.max;
+
 			//popup_edited_item->edited_signal.call( popup_edited_item_col );
 		} break;
 	default: { ERR_FAIL(); }