More macOS 13 compatibility issues

[nekohasekai]

Problem

On macOS 13, the editor crashes on launch, then shows a blank view after workaround.

Crash trace:

-[NSNib _initWithNibNamed:bundle:options:]
-[NSViewController _nibWithName:bundle:]
-[NSViewController loadView]

Workaround

The following changes make it work on macOS 13, but we don't fully understand why they're only needed on macOS 13:

1. Replace super.loadView() with self.view = NSView() in TextViewController, FindViewController, SuggestionViewController

2. Move styleTextView/ScrollView/MinimapView() before FindViewController creation in TextViewController.loadView()

See: nekohasekai@941f378