Issue #4650: Abort Mission Confirmation

Adapted the confirmation dialog from the CnC mod and wired it to
the "Abort" and "Surrender" buttons.

mods/ra/chrome/confirmation-dialogs.yaml

@@ -0,0 +1,34 @@
+Background@CONFIRM_PROMPT:
+	X: (WINDOW_RIGHT - WIDTH)/2
+	Y: (WINDOW_BOTTOM - 90)/2
+	Width: 370
+	Height: 175
+	Children:
+		Label@PROMPT_TITLE:
+			Width: PARENT_RIGHT
+			Y: 20
+			Height: 25
+			Font: Bold
+			Align: Center
+		Label@PROMPT_TEXT:
+			X: 15
+			Y: 50
+			Width: PARENT_RIGHT - 30
+			Height: 65
+			Align: Center
+		Button@CONFIRM_BUTTON:
+			X: 20
+			Y: PARENT_BOTTOM - 45
+			Width: 160
+			Height: 25
+			Text: Confirm
+			Font: Bold
+			Key: return
+		Button@CANCEL_BUTTON:
+			X: PARENT_RIGHT - 180
+			Y: PARENT_BOTTOM - 45
+			Width: 160
+			Height: 25
+			Text: Cancel
+			Font: Bold
+			Key: escape

mods/ra/mod.yaml

@@ -100,6 +100,7 @@ ChromeLayout:
 	mods/ra/chrome/assetbrowser.yaml
 	mods/ra/chrome/irc.yaml
 	mods/ra/chrome/missionbrowser.yaml
+	mods/ra/chrome/confirmation-dialogs.yaml
 
 Weapons:
 	mods/ra/weapons.yaml