Add issue button w/ some button updates (#221)

In this PR, I've added a "Report an issue" button and a few more
button-related changes:
- Add "Report an issue" button
- Add icon for "Octobot's source code"
- Rename `AboutTitleRepository` to `ButtonOpenRepository`
- Rename `OpenEventInfoButton` to `ButtonOpenEventInfo` to be consistent
with other language string names
- Rename `ColorsList.cs` to `Miscellaneous.cs`
- Add public const strings in `Octobot.cs` to get repository & issues links

---------

Signed-off-by: mctaylors <cantsendmails@mctaylors.ru>

src/Messages.Designer.cs

@@ -534,9 +534,9 @@ namespace Octobot {
             }
         }
 
-        internal static string OpenEventInfoButton {
+        internal static string ButtonOpenEventInfo {
             get {
-                return ResourceManager.GetString("OpenEventInfoButton", resourceCulture);
+                return ResourceManager.GetString("ButtonOpenEventInfo", resourceCulture);
             }
         }
 
@@ -630,9 +630,9 @@ namespace Octobot {
             }
         }
 
-        internal static string AboutTitleRepository {
+        internal static string ButtonOpenRepository {
             get {
-                return ResourceManager.GetString("AboutTitleRepository", resourceCulture);
+                return ResourceManager.GetString("ButtonOpenRepository", resourceCulture);
             }
         }
 
@@ -1028,5 +1028,13 @@ namespace Octobot {
                 return ResourceManager.GetString("ContactDevelopers", resourceCulture);
             }
         }
+
+        internal static string ButtonReportIssue
+        {
+            get
+            {
+                return ResourceManager.GetString("ButtonReportIssue", resourceCulture);
+            }
+        }
     }
 }