Allow quicklook to appear above extra pane

Closes #27

We want quicklook windows to appear above the pane.
We also want iTerm hotkey window to appear below the pane.
Tried `.modalPanel` and that doesn't work (iTerm appears on top)
`.mainMenu` seems to work.
https://jameshfisher.com/2020/08/03/what-is-the-order-of-nswindow-levels/

So now, the `NSWindow.Level` for extra pane is `.mainMenu` 🤷🏻‍♂️

AlfredExtraPane.xcodeproj/project.pbxproj

@@ -417,7 +417,7 @@
 					"@executable_path/../Frameworks",
 				);
 				MACOSX_DEPLOYMENT_TARGET = 11.0;
-				MARKETING_VERSION = 0.2.11;
+				MARKETING_VERSION = 0.2.12;
 				ONLY_ACTIVE_ARCH = NO;
 				OTHER_CODE_SIGN_FLAGS = "--deep";
 				PRODUCT_BUNDLE_IDENTIFIER = mr.pennyworth.AlfredExtraPane;
@@ -438,7 +438,7 @@
 					"@executable_path/../Frameworks",
 				);
 				MACOSX_DEPLOYMENT_TARGET = 11.0;
-				MARKETING_VERSION = 0.2.11;
+				MARKETING_VERSION = 0.2.12;
 				ONLY_ACTIVE_ARCH = NO;
 				OTHER_CODE_SIGN_FLAGS = "--deep";
 				PRODUCT_BUNDLE_IDENTIFIER = mr.pennyworth.AlfredExtraPane;

AlfredExtraPane/Pane.swift

@@ -150,7 +150,12 @@ func makeWindow() -> NSWindow {
     screen: NSScreen.main!
   )
   window.backgroundColor = .clear
-  window.level = .screenSaver
+  // We want quicklook windows to appear above the pane.
+  // We also want iTerm hotkey window to appear below the pane.
+  // Tried .modalPanel and that doesn't work (iTerm appears on top)
+  // .mainMenu seems to work
+  // https://jameshfisher.com/2020/08/03/what-is-the-order-of-nswindow-levels/
+  window.level = .mainMenu
   window.collectionBehavior = [
     .moveToActiveSpace, .stationary, .fullScreenAuxiliary
   ]