Basalt 1.7 Update

- New Objects (Flexbox, Graph, Treeview)
- Pluginsystem to add/remove functionality
- Reworked the entire Object system, instead of one big Object Class we have multiple classes: Object, VisualObject, ChangeableObject
- Instead of one big Frame Class we have multiple Frame Classes: BaseFrame, Frame, MovableFrame, ScrollableFrame, MonitorFrame, Flexbox
- Removed the Animation Object, and added a animation plugin instead
- Removed the Graphic Object and merged it's functionality with the image object
- Updated currently existing objects

docs/objects/ChangeableObject.md

@@ -0,0 +1,38 @@
+The ChangeableObject class is a subclass of VisualObject and Object that provides additional methods for handling changes to objects.
+
+In addition to the Object and VisualObject methods, changeableObjects also have the following methods:
+
+|   |   |
+|---|---|
+|[setValue](objects/Button/setText.md)|Changes the button text
+|[getValue](objects/Button/setHorizontalAlign.md)|Changes the horizontal text position
+|[onChange](objects/Button/setVerticalAlign.md)|Changes the vertical text position
+
+# Example
+
+Here's an example of how to create a fully functional button using the Button object:
+
+```lua
+local main = basalt.createFrame()
+local aButton = main:addButton():setText("Click")
+
+aButton:onClick(function(self,event,button,x,y)
+  if(event=="mouse_click")and(button==1)then
+    basalt.debug("Left mousebutton got clicked!")
+  end
+end)
+```
+
+Alternatively, you can create a button using an XML layout:
+
+```xml
+<button onClick="buttonClick" text="Click">
+  <onClick>
+    if(event=="mouse_click")and(button==1)then
+      basalt.debug("Left mousebutton got clicked!")
+    end
+  </onClick>
+</button>
+```
+
+In these examples, a button is created with the text "Click". When the left mouse button is clicked on the button, the message "Left mouse button got clicked!" is printed.