removing some serial functions

docs/reference/js/serial-library.md

@@ -126,15 +126,3 @@ This is useful if you have something connected at the other end. As explained ab
 let msg = serial.readString()
 ```
 
-* reads an image
-
-```
-img = serial.readImage()
-```
-
-* reads the state of the screen from serial
-
-```
-serial.readScreen()
-```
-

libs/microbit/serial.cpp

@@ -19,20 +19,4 @@ namespace serial {
     void writeString(StringData *text) { 
       uBit.serial.sendString(ManagedString(text));
     }
-
-    /**
-     * Sends the current pixel values, byte-per-pixel, over serial.
-     */
-    //%
-    void writeScreen() {
-        uBit.serial.sendDisplayState(); 
-    }
-
-    /**
-     * Reads the screen from serial.
-     */
-    //%
-    void readScreen() { 
-        uBit.serial.readDisplayState();
-    }
 }

libs/microbit/shims.d.ts

@@ -489,18 +489,6 @@ declare namespace serial {
      */
     //% shim=serial::writeString
     function writeString(text: string): void;
-
-    /**
-     * Sends the current pixel values, byte-per-pixel, over serial.
-     */
-    //% shim=serial::writeScreen
-    function writeScreen(): void;
-
-    /**
-     * Reads the screen from serial.
-     */
-    //% shim=serial::readScreen
-    function readScreen(): void;
 }