Fixes in engine files parsing regexes and mod desc.

Reviews sii file replacement regexes and adds some comments around the
substitutions.

Reviews default mod description to include that the github repository
exists.

ClutchFixer/ClutchFix.cs

@@ -17,6 +17,9 @@ public class ClutchFix
   private bool dirsMade = false;
 
   // https://modding.scssoft.com/wiki/Documentation/Engine/Units/accessory_engine_data
+  // Gives the 300rpm a torque value of 0.4 to drastically improve
+  // the clutch functionality. This means truck would have 40% strength
+  // until it gets its "cut rpm" to stall, or just recover ahead.
   private const string defaultTorqueCurve = @"
 $2torque_curve[]: (300, 0)
 $2torque_curve[]: (310, 0.45)
@@ -29,6 +32,8 @@ public class ClutchFix
 
   private HashSet<string> dlcs = new();
 
+  private Regex torque_re = new Regex(@"((\n[\t ]*torque_curve\[[\t ]*\]:[\t ]*\()[0-9]+ *, *0(?:.0)? *\))", RegexOptions.Compiled | RegexOptions.Singleline);
+
   public ClutchFix(string gameName, string gameInstallPath)
   {
     if (gameName == null) throw new ArgumentNullException("Game name must be specified.");
@@ -64,11 +69,13 @@ public void AddEngine(string targetPath, string contents, string dlc)
     // it doesn't play a role in the engine in low gears/rpm.
     if (!contents.Contains("torque_curve[]:"))
     {
-      contents = Regex.Replace(contents, @"(\n([\t ]*)volume:[\t ]*[0-9]+(\.[0-9]+){0,1}\n)", "$1" + defaultTorqueCurve + "\n\n");
+      contents = Regex.Replace(contents, @"(\n([\t ]*)volume:[\t ]*[0-9]+(\.[0-9]+){0,1}\n)", "${1}" + defaultTorqueCurve + "\n\n");
     }
     else
     {
-      contents = Regex.Replace(contents, @"((\n[\t ]*)torque_curve\[[\t ]*\]:[\t ]*\([456][0-9]{2},)", "$2torque_curve[]: (310, 0.45)$1");
+      // Gives the first torque entry a strength of 0.4 (40%), see
+      // defaultTorqueCurve above.
+      contents = torque_re.Replace(contents, "${1}${2}310, 0.45)", 1);
     }
 
     if (!dirsMade) makeDirs();
@@ -103,7 +110,7 @@ public void MakeManifest()
 
 Clutch deadzone-range should be reduced in options for additional realism (smaller actuation/""bite"" interval in the pedal).
 
-The process to generate this mod is automatic by a console app (.NET 6) that I'll probably host at https://github.com/avengerx/ClutchFix.
+The process to generate this mod is automated by a console app (.NET 6) that is hosted at https://github.com/avengerx/SCSClutchFixer.
 
 Generated for game version: [white]" + exactVer + @"[normal]
 Truck engines fixed: [white]" + engineCount + @"[normal]