Plus some template nonsense due to slot overloading

Fix bug: After a reconnect to robot/kinematic unit, local joint values can be wrong. Need to fetch the real joint values first to avoid large jumps when selecting the joint.

Also adds additional overloads to prediction methods for better
usability.

The header is very expensive and is often used in cases where a simple for loop does the exact same thing..

This reduces the amount of headers that are necessary for different use cases

Also use fancy "specialValueText" for recursion depth spinner.