hiding the was pressed block (#401)

libs/core/buttons.ts

@@ -95,6 +95,7 @@ namespace brick {
         //% help=brick/button/was-pressed
         //% block="%button|was pressed"
         //% blockId=buttonWasPressed
+        //% blockHidden=true
         //% parts="brick"
         //% blockNamespace=brick
         //% weight=80

libs/infrared-sensor/docs/reference/sensors/beacon/was-pressed.md

@@ -26,7 +26,7 @@ In order to recognize a button event signalled from a remote beacon, an infrared
 
 If the beacon button ``top left`` was pressed, show a `green` status light. Otherwise, set the status light to `orange`.
 
-```blocks
+```typescript
 sensors.infrared1.setRemoteChannel(InfraredRemoteChannel.Ch0)
 forever(function () {
     if (sensors.remoteButtonTopLeft.wasPressed()) {

libs/infrared-sensor/ir.ts

@@ -101,6 +101,7 @@ namespace sensors {
         //% help=sensors/beacon/was-pressed
         //% block="**remote button** %button|was pressed"
         //% blockId=remotebuttonWasPressed
+        //% blockHidden=true
         //% parts="remote"
         //% blockNamespace=sensors
         //% weight=80

libs/touch-sensor/docs/reference/sensors/touch-sensor/was-pressed.md

@@ -16,7 +16,7 @@ If a touch sensor was pressed, then that event is remembered. Once you check if
 
 If the touch sensor ``touch 1`` was pressed, show a `green` status light. Otherwise, set the status light to `orange`.
 
-```blocks
+```typescript
 forever(function () {
     if (sensors.touch1.wasPressed()) {
         brick.setStatusLight(StatusLight.Green)

libs/touch-sensor/touch.ts

@@ -83,6 +83,7 @@ namespace sensors {
         //% help=sensors/touch-sensor/was-pressed
         //% block="**touch** %this|was pressed"
         //% blockId=touchWasPressed
+        //% blockHidden=true
         //% parts="touch"
         //% blockNamespace=sensors
         //% this.fieldEditor="ports"