configure Analyst listening port via Administration manager => Preferences

Please add capability to configure Analyst listening port(start from 8000) via Administration manager => Preferences, occasionally some of our customers need to change this to avoid conflict with other software.

Currently the only way is to modify below config file, however, changing it using text editor is error prone, and the modified file will be replaced if applying hotfix, so it has to be done once again after hotfix.

C:\Users\[user]\AppData\Local\Spotfire\14.0.2\Modules\Spotfire DXP Forms_62.2.xxxxx.xxxx\Spotfire.Dxp.Main.dll.config

<!--

Determines the first (lowest) port that the internal web server shall attempt to bind to.

If a negative value is specified, this setting defaults to 8000.

-->

<setting name="WebServerPortFrom" serializeAs="String">

<value>-1</value>

</setting>