Add autoscroll, preferred width and selected sampler name in ViewResultsTree listener

[KingRabbid]

Description

Add 2 configurable parameters to allow enabling by default the scroll tick in the ViewResultsTree box and also to set the width of the tree to desired value. Parameters are defined in jmeter.properties file.

Motivation and Context

I have to load & run many JMXs per day and every time I have to adjust the tick and the width to a personal preference, it's annoying. Also with various resolutions the width makes sense to have different values than the standard one.

How Has This Been Tested?

Run with multiple values in the .properties file, see the outcome.

Screenshots (if appropriate):

Types of changes

• New feature

Checklist:

• [x] My code follows the [code style][style-guide] of this project.
• [x] I have updated the documentation accordingly.