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/docs1_6/tips/events.md

@@ -0,0 +1,34 @@
+
+## Short way of adding functions to events
+Not everyone knows that a function (or in other words a method) does not need to have a name. Instead of a function name you are also able to add the function itself as a argument.
+
+Both do the exact same thing:
+```lua
+local function clickButton()
+  basalt.debug("I got clicked!")
+end
+button:onClick(clickButton)
+```
+
+```lua
+button:onClick(function()
+  basalt.debug("I got clicked!")
+end)
+```
+
+## Using isKeyDown for shortcuts
+there is also a function with which you can check if the user is holding a key down, it is called `basalt.isKeyDown()`. It's especially useful for click events.
+Let us say you want a button to execute something, but if you are holding ctrl down, something in the execution should get changed. This is how you would
+achieve that:
+
+```lua
+button:onClick(function()
+  if(basalt.isKeyDown(keys.leftCtrl)then
+    basalt.debug("Ctrl is down!")
+  else
+    basalt.debug("Ctrl is up!")
+  end
+end)
+```
+
+Make sure to always use the available `keys` table: https://computercraft.info/wiki/Keys_(API)