Changed enum naming to reflect naming conventions and libplctag langu…

…age.

In the libplctag wiki, the language used is
* "Status code", not a "status"
* "Debug level" not a "Debug"
* "Event" not an "Event code"

src/libplctag.NativeImport/DEBUG_LEVELS.cs → src/libplctag.NativeImport/DEBUG_LEVEL.cs

@@ -12,12 +12,12 @@ namespace libplctag.NativeImport
     /// There are three ways to set the debug level (for historical reasons):
     /// <list type="number">
     ///     <item>Adding a debug attribute to the attribute string when creating a tag: "protocol=XXX&amp;...&amp;debug=4".</item>
-    ///     <item>Using the <see cref="plctag.plc_tag_set_int_attribute(int, string, int)"/>function to set the debug attribute.</item>
-    ///     <item>Using the <see cref="plctag.plc_tag_set_debug_level(int)"/> function.</item>
+    ///     <item>Using the <see cref="plctag.plc_tag_set_int_attribute"/>function to set the debug attribute.</item>
+    ///     <item>Using the <see cref="plctag.plc_tag_set_debug_level"/> function.</item>
     /// </list>
     /// The preferred method in code is the last one.
     /// </summary>
-    public enum DEBUG_LEVELS
+    public enum DEBUG_LEVEL
     {
         /// <summary>
         /// Disables debugging output.

src/libplctag.NativeImport/EVENT_CODES.cs → src/libplctag.NativeImport/EVENT.cs

@@ -11,7 +11,7 @@ namespace libplctag.NativeImport
     /// The library provides functions to register a callback on a tag.
     /// These events generate a call to that callback.
     /// </summary>
-    public enum EVENT_CODES
+    public enum EVENT
     {
         /// <summary>
         /// A read of the tag has been requested.

src/libplctag.NativeImport/STATUS_CODES.cs → src/libplctag.NativeImport/STATUS_CODE.cs

@@ -11,7 +11,7 @@ namespace libplctag.NativeImport
     /// Most functions return a status code.
     /// It will be one of these.
     /// </summary>
-    public enum STATUS_CODES
+    public enum STATUS_CODE
     {
         /// <summary>
         /// Operation in progress. Not an error.