Move checkmark and back arrow into .qrc file

The QRC file is a platform independant way of referring to resource
files. It allows the program to access resources in an abstract way
instead of the direct file path.

This is the first step towards moving all files to the new system.

advancedSettings.pro

@@ -126,8 +126,6 @@ DISTFILES += \
     src/res/battery_4.png \
     src/res/battery_5.png \
     src/res/thumbicon.png \
-    src/res/qml/backarrow.svg \
-    src/res/qml/check.svg \
     src/res/qml/mic_off.svg \
     src/res/qml/mic_on.svg \
     src/res/qml/ptt_notification.svg \
@@ -170,3 +168,5 @@ DISTFILES += \
     src/res/qml/audio_page/push_to_talk/* \
     src/res/qml/audio_page/profiles/* \
     src/res/qml/common/* \
+
+RESOURCES += src/res/resources.qrc

src/res/qml/common/MyStackViewPage.qml

@@ -26,7 +26,7 @@ Rectangle {
                 enabled: headerShowBackButton
                 opacity: headerShowBackButton ? 1.0 : 0.0
                 contentItem: Image {
-                    source: "backarrow.svg"
+                    source: "qrc:/common/back-arrow"
                     sourceSize.width: 50
                     sourceSize.height: 50
                     anchors.fill: parent

src/res/qml/common/MyToggleButton.qml

@@ -31,7 +31,7 @@ CheckBox {
             height: 28
 			x: (parent.width - width) / 2
 			y: (parent.height - height) / 2
-            source: "check.svg"
+            source: "qrc:/common/box-checkmark"
 			sourceSize.width: width
 			sourceSize.height: height
 			visible: parent.parent.checked

src/res/resources.qrc

@@ -0,0 +1,6 @@
+<!DOCTYPE RCC><RCC version="1.0">
+<qresource prefix="/common">
+    <file alias="back-arrow">img/common/backarrow.svg</file>
+    <file alias="box-checkmark">img/common/check.svg</file>
+</qresource>
+</RCC>