Feature/state machine (#1705)

* Fix script error in old state machine example

* Add a module with a more complex state machine, that can be created and controlled through the Lua API. Useful for interactive installations

* Add an example asset for the new state machine and rename the old linear "state machine" to luastatemachine


Co-authored-by: Malin Ejdbo <malin.ejdbo@gmail.com>

data/assets/util/lua_state_machine_helper.asset

@@ -1,3 +1,8 @@
+-- Contains the required functions to create a simple Lua state machine, that can step 
+-- forwards and backwards through a list of states.
+--
+-- A state is given as a table with a Title string, and two functions: Play and Rewind
+-- (see example asset)
 
 local goToNextStateFunction = function (machine)
   if (machine.currentStateIndex >= #machine.states) then