Fixing LuwrainObj.launchApp() with args

Minor fix to core.Standalone

Adding json.MainMenuItem

JS: Adding Luwrain.message.ok()

Updating README

An attempt to fix mysterious crash on Windows with nulls in File.list…

…Files()

Adding DynamicExtensionException

Fix to EditArea (no entering at all)

shutdown, reboot and suspend commands

Fix to OS commands

- Fixed a bug with using of /org/luwrain/commands/os registry key
- JavaFX player disabled