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/VisualObject/setZIndex.md

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+## setZIndex
+
+### Description
+
+Sets the z-index for the object. A higher value means a higher draw and event priority. You can also add multiple objects to the same z-index; in this case, the last added object will have the highest priority.
+
+### Parameters
+
+1. `number` z-index
+
+### Returns
+
+1. `object` The object in use
+
+### Usage
+
+* Sets the button's z-index to `1` and the label's z-index to `2`
+
+```lua
+local basalt = require("basalt")
+
+local mainFrame = basalt.createFrame()
+local aButton = mainFrame:addButton():setZIndex(1):setPosition(2,2)
+local aLabel = mainFrame:addLabel():setZIndex(2):setPosition(2,2):setText("I am a label!")
+```
+
+```xml
+<button x="2" y="2" zIndex="1" />
+<label x="2" y="2" text="I am a label!" zIndex="2" />
+```