Build: Put all AMD modules in "src/" in strict mode

Fixes gh-3073

src/css/addGetHookIf.js

@@ -1,5 +1,7 @@
 define( function() {
 
+"use strict";
+
 function addGetHookIf( conditionFn, hookFn ) {
 
 	// Define the hook, we'll check on the first run if it's really needed.

src/css/adjustCSS.js

@@ -3,6 +3,8 @@ define( [
 	"../var/rcssNum"
 ], function( jQuery, rcssNum ) {
 
+"use strict";
+
 function adjustCSS( elem, prop, valueParts, tween ) {
 	var adjusted,
 		scale = 1,

src/css/curCSS.js

@@ -7,6 +7,8 @@ define( [
 	"../selector" // Get jQuery.contains
 ], function( jQuery, rnumnonpx, rmargin, getStyles, support ) {
 
+"use strict";
+
 function curCSS( elem, name, computed ) {
 	var width, minWidth, maxWidth, ret,
 		style = elem.style;

src/css/hiddenVisibleSelectors.js

@@ -3,6 +3,8 @@ define( [
 	"../selector"
 ], function( jQuery ) {
 
+"use strict";
+
 jQuery.expr.pseudos.hidden = function( elem ) {
 	return !jQuery.expr.pseudos.visible( elem );
 };

src/css/showHide.js

@@ -4,6 +4,8 @@ define( [
 	"../css/var/isHiddenWithinTree"
 ], function( jQuery, dataPriv, isHiddenWithinTree ) {
 
+"use strict";
+
 var defaultDisplayMap = {};
 
 function getDefaultDisplay( elem ) {

src/css/support.js

@@ -5,6 +5,8 @@ define( [
 	"../var/support"
 ], function( jQuery, document, documentElement, support ) {
 
+"use strict";
+
 ( function() {
 
 	// Executing both pixelPosition & boxSizingReliable tests require only one layout

src/css/var/cssExpand.js

@@ -1,3 +1,5 @@
 define( function() {
+	"use strict";
+
 	return [ "Top", "Right", "Bottom", "Left" ];
 } );

src/css/var/getStyles.js

@@ -1,4 +1,6 @@
 define( function() {
+	"use strict";
+
 	return function( elem ) {
 
 		// Support: IE <=11 only, Firefox <=30 (#15098, #14150)

src/css/var/isHiddenWithinTree.js

@@ -4,6 +4,7 @@ define( [
 
 	// css is assumed
 ], function( jQuery ) {
+	"use strict";
 
 	// isHiddenWithinTree reports if an element has a non-"none" display style (inline and/or
 	// through the CSS cascade), which is useful in deciding whether or not to make it visible.

src/css/var/rmargin.js

@@ -1,3 +1,5 @@
 define( function() {
+	"use strict";
+
 	return ( /^margin/ );
 } );

src/css/var/rnumnonpx.js

@@ -1,5 +1,7 @@
 define( [
 	"../../var/pnum"
 ], function( pnum ) {
+	"use strict";
+
 	return new RegExp( "^(" + pnum + ")(?!px)[a-z%]+$", "i" );
 } );

src/css/var/swap.js

@@ -1,5 +1,7 @@
 define( function() {
 
+"use strict";
+
 // A method for quickly swapping in/out CSS properties to get correct calculations.
 return function( elem, options, callback, args ) {
 	var ret, name,