updated pxt (#2465)

* updated pxt

* bump pxt

* updated react

* updated ptx

* Remove empty variable element from XML

* Bump pxt-core to 5.25.15

* bump pxt

* Bump pxt to 5.25.17

* Add precision to music slider

libs/core/_locales/core-jsdoc-strings.json

@@ -106,6 +106,7 @@
   "Image.showImage": "Shows an frame from the image at offset ``x offset``.",
   "Image.showImage|param|xOffset": "column index to start displaying the image",
   "Image.width": "Gets the width in columns",
+  "Infinity": "Constant representing positive infinity.",
   "Math": "More complex operations with numbers.",
   "Math.abs": "Returns the absolute value of a number (the value without regard to whether it is positive or negative).\nFor example, the absolute value of -5 is the same as the absolute value of 5.",
   "Math.abs|param|x": "A numeric expression for which the absolute value is needed.",
@@ -170,6 +171,8 @@
   "Math.tan|param|x": "An angle in radians",
   "Math.trunc": "Returns the number with the decimal part truncated.",
   "Math.trunc|param|x": "A numeric expression.",
+  "NaN": "Constant representing Not-A-Number.",
+  "Number.isNaN": "Check if a given value is of type Number and it is a NaN.",
   "Number.toString": "Returns a string representation of a number.",
   "Object.keys": "Return the field names in an object.",
   "String": "Combine, split, and search text strings.",

libs/core/blocks-test/led.blocks

@@ -1,5 +1,4 @@
 <xml xmlns="http://www.w3.org/1999/xhtml">
-  <variables></variables>
   <block type="pxt-on-start" x="20" y="20">
     <statement name="HANDLER">
       <block type="device_plot">

libs/core/blocks-test/pins.blocks

@@ -1,5 +1,4 @@
 <xml xmlns="http://www.w3.org/1999/xhtml">
-  <variables></variables>
   <block type="pins_on_pulsed" x="-157" y="130">
     <field name="pin">DigitalPin.P5</field>
     <field name="pulse">PulseValue.Low</field>

libs/core/blocks-test/test.blocks

@@ -610,7 +610,7 @@
           <block type="device_set_tempo">
             <value name="value">
               <shadow type="math_number_minmax">
-                <mutation min="4" max="400" label="Bpm"></mutation>
+                <mutation min="4" max="400" label="Bpm" precision="0"></mutation>
                 <field name="SLIDER">12312312</field>
               </shadow>
             </value>