ITimeZoneService rewrite (#722)

* Clean up ITimeZoneService

Add error codes and simplify parsing

* Add accurate timezone logic

TOOD: LoadTimeZoneRule and location name cmds.

* Integrate the new TimeZone logic

* SCREAMING_UNIX_CASE => PascalCase

* Address comments

* Reduce use of pointer in the LoadTimeZoneRule logic

* Address comments

* Realign tzIfStream logic in LoadTimeZoneRule

* Address gdk's comments

Ryujinx.HLE/Utilities/StreamUtils.cs

@@ -0,0 +1,16 @@
+using System.IO;
+
+namespace Ryujinx.HLE.Utilities
+{
+    static class StreamUtils
+    {
+        public static byte[] StreamToBytes(Stream input)
+        {
+            using (MemoryStream ms = new MemoryStream())
+            {
+                input.CopyTo(ms);
+                return ms.ToArray();
+            }
+        }
+    }
+}

Ryujinx.HLE/Utilities/StringUtils.cs

@@ -95,5 +95,31 @@ namespace Ryujinx.HLE.Utilities
                 return Encoding.UTF8.GetString(ms.ToArray());
             }
         }
+
+        public static unsafe int CompareCStr(char* s1, char* s2)
+        {
+            int s1Index = 0;
+            int s2Index = 0;
+
+            while (s1[s1Index] != 0 && s2[s2Index] != 0 && s1[s1Index] == s2[s2Index])
+            {
+                s1Index += 1;
+                s2Index += 1;
+            }
+
+            return s2[s2Index] - s1[s1Index];
+        }
+
+        public static unsafe int LengthCstr(char* s)
+        {
+            int i = 0;
+
+            while (s[i] != '\0')
+            {
+                i++;
+            }
+
+            return i;
+        }
     }
 }