Changes in the main window

Version 1.3 changes something in the main window:

1. The buttons that are highlighted with a green rectangle hide or show trees. For example the first button hides the Matrix tree. Clicking it once again the Matrix tree is displayed again.
   The second button toggles the Function tree visibility, the third the Presentation tree, the 4th the Chart tree and 5th the Timer tree.
2. On the top of each tree, together with the tree menu, there is a search bar, highlighted with a red rectangle.
   Writing a part of the name/package of the item to search (matrix, function...) and clicking on the green arrow button, the next item with name-package containing that text is selected and showed in the tree.
   For example the text ding.pri finds the item trading.price.