force showing the log window on L_ERROR, use red foreground color for L_ERROR messages, use bold weight for L_WARNING
messages
removed alloca()
removed more alloca()
changed alert message if "open-file" fails, close filechooser dialog if open fails
only force show log on L_ERROR messages when it's not already visible
added "Plugin info" item to Edit -> Hardware menu, added "use_action_appearance=true" to all menu items
added "move element up/down" callback stubs, minor cleanups
enable/disable actions - not widgets, added "move up/down" elements