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/getBackground.md

@@ -0,0 +1,21 @@
+## getBackground
+
+### Description
+
+Returns the current background color
+
+### Returns
+
+1. `number|false` color (returns false if the background is transparent)
+
+### Usage
+
+* Retrieves the background color of an object and prints it to the debug console:
+
+```lua
+local basalt = require("basalt")
+
+local mainFrame = basalt.createFrame():setBackground(colors.gray)
+local bgColor = mainFrame:getBackground()
+basalt.debug(bgColor) -- prints colors.gray
+```