Moved a lot of core functionality into new Common library

- Remove System.IO from Implicit Usings.

CyberBits.Common/FileFetcher.cs

@@ -0,0 +1,31 @@
+namespace CyberBits.Common;
+
+public static class FileFetcher
+{
+    public static string LoadTextFile(string filename, bool userDir = false)
+    {
+        var location = "res";
+
+        if (userDir)
+            location = "user";
+
+        using var file = FileAccess.Open($"{location}://{filename}", FileAccess.ModeFlags.Read);
+        var contents = file.GetAsText();
+
+        file.Close();
+        return contents;
+    }
+
+    public static ConfigFile LoadConfig(string filename, bool userDir = false)
+    {
+        var config = new ConfigFile();
+
+// Load data from a file.
+        var err = config.Load(LoadTextFile(filename, userDir));
+
+        if (err != Error.Ok)
+            sys.Environment.Exit(sys.Environment.ExitCode);
+
+        return config;
+    }
+}