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/List/getItemIndex.md

@@ -1,17 +1,23 @@
 ## getItemIndex
-returns the item index of the currently selected item
 
-#### Returns:
+### Description
+
+Returns the item index of the currently selected item.
+
+#### Returns
+
 1. `number` The current index
 
-#### Usage:
-* Creates a default list with 3 entries selects the second entry and prints the currently selected index.
+### Usage
+
+* Creates a default list with 3 entries and removes the second one.
+
 ```lua
 local mainFrame = basalt.createFrame()
 local aList = mainFrame:addList()
 aList:addItem("1. Entry")
-aList:addItem("2. Entry",colors.yellow)
-aList:addItem("3. Entry",colors.yellow,colors.green)
+aList:addItem("2. Entry", colors.yellow)
+aList:addItem("3. Entry", colors.yellow, colors.green)
 aList:selectItem(2)
 basalt.debug(aList:getItemIndex())
-```
+```