do not remove manually added entries

BGS/LogEntry.cs

@@ -11,6 +11,11 @@ namespace NonaBGS.BGS {
         public string Station { get; set; }
         public string System { get; set; }
         public string Faction { get; set; }
+        /// <summary>
+        /// Whether this entry was manually added. Manually added entries are not deleted
+        /// when a new scan is made. Instead they are preserved.
+        /// </summary>
+        public bool ManuallyAdded { get; set; }
 
         /// <summary>
         /// Whether this entry only benefits the controlling faction or not, default: no

BGS/Objective.cs

@@ -16,6 +16,12 @@ namespace NonaBGS.BGS {
             get => entries;
             set => entries = value;
         }
+        public void Clear() {
+            if (entries == null) {
+                return;
+            }
+            entries.RemoveAll(x => !x.ManuallyAdded);
+        }
 
         public int Matches(LogEntry e) {
             int match_count = 0;

BGS/Report.cs

@@ -54,7 +54,7 @@ namespace NonaBGS.BGS {
             string current_station = null;
             string controlling_faction = null;
 
-            this.objectives.ForEach(x => x.LogEntries.Clear());
+            objectives.ForEach(x => x.Clear());
 
             foreach (var e in relevant) {
                 LogEntry entry = null;