Honor the JAVA_HOME environment variable

[stoty]

Is your feature request related to a problem? Please describe.
Visualvm does not honor the JAVA_HOME variable. Having to start it with "bin/visualvm --jdkhome $JAVA_HOME" is an unneccessary annoyance.

Describe the solution you'd like
If JAVA_HOME is set, then visualVM should use it as the default value for the jdkhome.
If it is not set, visualvm should behave as it does today.

Describe alternatives you've considered
None

Additional context
JAVA_HOME is used by most Java startup scritps to locate the JRE to be used.
Developers expect JAVA_HOME to be honored, and is usually set correctly on developer machines by jenv, sdkman, etc.