Optimize Java JVM for Matlab

Matlab UI has been very slow and buggy on MacOS due to the default JVM. A fast JVM can be used to fix this: 

1. Download and install Azul JDK 8. 

    NOTE: JDK 11 would also work on latest version of Matlab. Newer version doesn't work with Matlab.

2. Set the new JVM to Matlab using matlab_jenv command:

/Applications/MATLAB_R2021b.app/bin/matlab_jenv /Library/Java/JavaVirtualMachines/zulu-8.jdk/Contents/Home/jre/

    NOTE: can also run jenv command in Matlab to assign the path of new JVM.

    NOTE: for JDK 11, use /Library/Java/JavaVirtualMachines/zulu-8.jdk/Contents/Home/

3. Run Matlab and confirm the new JVM by 'version -java'

4. To reset to default JVM, use:

/Applications/MATLAB_R2021b.app/bin/matlab_jenv factory