Move TagType into separate header

So it can be used in different places without creating a dependency loop.

CMakeLists.txt

@@ -86,6 +86,7 @@ set(HEADER_FILES
     size.h
     tag.h
     tagtarget.h
+    tagtype.h
     tagvalue.h
     vorbis/vorbiscomment.h
     vorbis/vorbiscommentfield.h

tag.h

@@ -2,6 +2,7 @@
 #define TAG_PARSER_TAG_H
 
 #include "./tagtarget.h"
+#include "./tagtype.h"
 #include "./tagvalue.h"
 
 #include <c++utilities/io/binaryreader.h>
@@ -12,21 +13,6 @@
 
 namespace TagParser {
 
-/*!
- * \brief Specifies the tag type.
- *
- * \sa Tag::type()
- */
-enum class TagType : unsigned int {
-    Unspecified = 0x00, /**< The tag type is unspecified. */
-    Id3v1Tag = 0x01, /**< The tag is a TagParser::Id3v1Tag. */
-    Id3v2Tag = 0x02, /**< The tag is a TagParser::Id3v2Tag. */
-    Mp4Tag = 0x04, /**< The tag is a TagParser::Mp4Tag. */
-    MatroskaTag = 0x08, /**< The tag is a TagParser::MatroskaTag. */
-    VorbisComment = 0x10, /**< The tag is a TagParser::VorbisComment. */
-    OggVorbisComment = 0x20 /**< The tag is a TagParser::OggVorbisComment. */
-};
-
 /*!
  * \brief Specifies the field.
  *

tagtype.h

@@ -0,0 +1,23 @@
+#ifndef TAG_PARSER_TAG_TYPE_H
+#define TAG_PARSER_TAG_TYPE_H
+
+namespace TagParser {
+
+/*!
+ * \brief Specifies the tag type.
+ *
+ * \sa Tag::type()
+ */
+enum class TagType : unsigned int {
+    Unspecified = 0x00, /**< The tag type is unspecified. */
+    Id3v1Tag = 0x01, /**< The tag is a TagParser::Id3v1Tag. */
+    Id3v2Tag = 0x02, /**< The tag is a TagParser::Id3v2Tag. */
+    Mp4Tag = 0x04, /**< The tag is a TagParser::Mp4Tag. */
+    MatroskaTag = 0x08, /**< The tag is a TagParser::MatroskaTag. */
+    VorbisComment = 0x10, /**< The tag is a TagParser::VorbisComment. */
+    OggVorbisComment = 0x20 /**< The tag is a TagParser::OggVorbisComment. */
+};
+
+} // namespace TagParser
+
+#endif // TAG_PARSER_TAG_TYPE_H