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/Graph/setGraphSymbol.md

@@ -0,0 +1,22 @@
+## setGraphSymbol
+
+### Description
+
+Sets the symbol used for the graph.
+
+### Parameters
+
+1. `string` symbol - The symbol to be used for the graph.
+
+### Returns
+
+1. `object` The object in use
+
+### Usage
+
+* Sets the graph symbol to "X"
+
+```lua
+local mainFrame = basalt.createFrame()
+local aGraph = mainFrame:addGraph():setGraphSymbol("X")
+```