Use style singleton on chat bubbles

retroshare-qml-app/src/styles/ChatBubblesStyle.qml

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+import QtQuick 2.0
+pragma Singleton
+
+QtObject {
+
+//	Margins
+	readonly property int lMarginBubble: 10
+	readonly property int rMarginBubble: 10
+	readonly property int tMarginBubble: 5
+	readonly property int bMarginBubble: 10
+	readonly property int aditionalBubbleHeight: tMarginBubble * 2
+	readonly property int aditionalBubbleWidth: 30
+
+// BubbleProps
+	readonly property int radius: 5
+
+
+//	Colors
+	readonly property string colorIncoming: "lightGreen"
+	readonly property string colorOutgoing: "aliceblue"
+	readonly property string colorSenderName: "cornflowerblue"
+	readonly property string colorMessageTime: "grey"
+
+
+}