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/Checkbox/setSymbol.md

@@ -1,18 +1,26 @@
 ## setSymbol
+
+### Description
+
 Changes the checkbox symbol, default is "\42"
 
-#### Parameters: 
+### Parameters
+
 1. `string` symbol
 
-#### Returns:
+### Returns
+
 1. `object` The object in use
 
-#### Usage:
+### Usage
+
 * Creates a new checkbox and changes the symbol to o
+
 ```lua
 local main = basalt.createFrame()
 local checkbox = main:addCheckbox():setSymbol("o")
 ```
+
 ```xml
 <checkbox symbol="o" />
-```
+```