Add support for Java 14 switch expressions

Created by: Santarii

Description

Switch expressions were added in Java 14, but produce a strange compile time error in Processing which is on Java 17.0.2.

Expected Behavior

Switch expressions should compile.

Current Behavior

They do not compile, and the first line in my exam,ple produces an error of "Syntax Error - Missing name or ; near ' int b = switch'?".

Steps to Reproduce

void setup() {
  int a = 0;
  int b = switch(a) {
    case 0 -> 0;
    default -> 1;
  };
  exit();
}

This switch expression runs fine in Eclipse and online IDEs that are in Java 17, but not in Processing. Other language features that are newer than switch expressions do work correctly.

Your Environment

• Processing version: 4.0b6.
• Operating System and OS version: Windows 10 Home 64-bit. 10.0.19043 Build 19043.