appendToPATH method
Appends path
to the end of the PATH
by updating the Windows Registry.
We update the user's PATH (HKEY_CURRENT_USER) rather
than the system path so this change will only
affect the logged in user.
Note: this doesn't update current scripts PATH.
In almost all shells you will need to restart the terminal in order for the path change to take affect.
Implementation
bool appendToPATH(String path) {
regAppendToPath(path);
return true;
}