Add important stuff to Quickref from removed java quickref, e.g. examples from java.util and java.io etc.

[bjornregnell]

• java.lang.String, StringBuilder, StringBuffer

• java.util.Scanner

• java.io.File

• wrapper-klasser och autoboxing

• javax.swing ???

• java.Math

• java.util.Date

• java.util.Random

etc

[bjornregnell]

Decided to just keep Scanner and som file stuff from java.util java.io java.nio