connected v0.9.0

Connected changes for v0.9.0:

• fixed an off-by-one bug with the Switch node
• fixed handling of numbers in Condition node
• updated Roslyn compiler to 1.8.1, now up to C# 9 language features supported
• tried to optimize performance, nodes outside of screen are not rendered anymore
• added scrollbar to text editor
• added option to set a config file via command line
• added alterable amount of in and out connectors to Script node
• added option to disable Unity's rich text feature in certain text fields

• made "path_base", "path_gamedata", "path_editordata", "path_loca", "path_backups" and "unity_rich_text" overridable in config file

I'm also working on a Godot game that will use connected for the dialogs, which means there will soon be a Godot/connected plugin.