Rebrand files names Spectral -> NeoChat

imports/NeoChat/Dialog/OpenFileDialog.qml

@@ -0,0 +1,12 @@
+import QtQuick 2.12
+import Qt.labs.platform 1.1
+
+FileDialog {
+    signal chosen(string path)
+
+    id: root
+
+    title: "Please choose a file"
+
+    onAccepted: chosen(file)
+}