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/objects/Thread.md

@@ -0,0 +1,65 @@
+Threads are being executed simultaneously.
+<br>
+
+## start
+starts a new thread and executes the function
+#### Parameters: 
+1. `function` the function which should be executed
+
+#### Returns:
+1. `object` The object in use
+
+#### Usage:
+* Starts a new thread
+```lua
+local mainFrame = basalt.createFrame()
+local aThread = mainFrame:addThread()
+local function randomThreadFunction()
+    while true do
+        basalt.debug("Thread is active")
+        os.sleep(1) -- a sleep/coroutine.yield() or pullEvent is required otherwise we will never come back to the main program (error)
+    end
+end
+aThread:start(randomThreadfunction)
+```
+you are also able to start threads via xml:
+```lua
+    basalt.setVariable("myThread", function() while true do os.sleep(1) end end)
+```
+```xml
+<thread thread="myThread" start="true"/>
+```
+
+## stop
+stops the thread
+
+#### Returns:
+1. `object` The object in use
+
+#### Usage:
+* Stops the current running thread by clicking on a button
+```lua
+local mainFrame = basalt.createFrame()
+local aThread = mainFrame:addThread()
+local function randomThreadFunction()
+    while true do
+        basalt.debug("Thread is active")
+        os.sleep(1) -- a sleep/coroutine.yield() or pullEvent is required otherwise we will never come back to the main program (error)
+    end
+end
+aThread:start(randomThreadfunction)
+local aButton = mainFrame:addButton():setText("Stop Thread"):onClick(function() aThread:stop() end)
+```
+
+## getStatus
+gets the current thread status
+
+#### Returns:
+1. `string` current status - ("running", "normal", "suspended", "dead")
+
+#### Usage:
+```lua
+local mainFrame = basalt.createFrame()
+local aThread = mainFrame:addThread()
+basalt.debug(aThread:getStatus())
+```