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/isVisible.md

@@ -0,0 +1,21 @@
+## isVisible
+
+Returns whether the object is currently visible or not.
+
+### Returns
+
+1. `boolean` The current visibility state of the object (true for visible, false for hidden)
+
+#### Usage
+
+* Prints the visibility state of an object to the debug console:
+
+```lua
+local basalt = require("basalt")
+
+local mainFrame = basalt.createFrame()
+local aButton = mainFrame:addButton():setSize(5, 8)
+basalt.debug(aButton:isVisible()) -- returns true
+```
+
+In this example, the isVisible method is called on aButton, and its visibility state is printed to the debug console. Since the button is visible by default, the output will be true.