Rework chat line templates and logic

- Extract chat line templates and logic so they can be reused across widgets
- Make text notification styling entirely template driven (by removing chat color configuration and making color optional for `TextNotification`)
- Add a new TextNotificationsDisplay widget (based on and replacing ChatDisplayWidget)
- Add timestamp support to text notifications

mods/common/chrome/text-notifications.yaml

@@ -0,0 +1,39 @@
+Container@CHAT_LINE_TEMPLATE:
+	Width: PARENT_RIGHT
+	Height: 16
+	Children:
+		Label@TIME:
+			X: 5
+			Width: 37
+			Height: 16
+			Shadow: True
+		Label@PREFIX:
+			X: 5
+			Height: 16
+			Shadow: True
+		Label@TEXT:
+			X: 5
+			Height: 16
+			WordWrap: True
+			Shadow: True
+
+Container@SYSTEM_LINE_TEMPLATE:
+	Width: PARENT_RIGHT
+	Height: 16
+	Children:
+		Label@TIME:
+			X: 5
+			Width: 37
+			Height: 16
+			Shadow: True
+		Label@PREFIX:
+			X: 5
+			Height: 16
+			Shadow: True
+			TextColor: FFFF00
+		Label@TEXT:
+			X: 5
+			Height: 16
+			WordWrap: True
+			Shadow: True
+			TextColor: FFFF00