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/setBackground.md

@@ -0,0 +1,27 @@
+## setBackground
+
+### Description
+
+Changes the object background color. If you set the value to `false`, the background won't be visible, allowing you to see through a frame, for example.
+
+### Parameters
+
+1. `number|color|false` Background color
+1. `char` (Optional) Background symbol you want to draw
+1. `number|color` (Optional) Background symbol color
+
+### Returns
+
+1. `object` Creates a frame, and sets its background color to colors.gray, also sets a background symbol with color black.
+
+### Usage
+
+* Creates a frame, and sets its background color to `colors.gray`, also sets a background symbol with color black.
+
+```lua
+local mainFrame = basalt.createFrame():setBackground(colors.gray, "#", colors.black)
+```
+
+```xml
+<button bg="gray" />
+```