* Fixed a bug where a standalone Lua script w/o a run function will hang the GUI on non-color radios
* Prevent Lua standalone window from opening if Lua failed on load
* Fixed scroll down key in TX12 simulator
Copied key definitions from TX16S
* Fixed the Lua error trying to call nil value when no scripts are loaded.
* I messed up in the previous commit; now it does not freeze and it does not call nil.
