Merge pull request #794 from TsudaKageyu/utf8-library

Replace unicode.h/unicode.cpp by the UTF8-CPP library.

diff --cc taglib/toolkit/tstring.cpp
Simple merge

diff --cc tests/test_string.cpp
index e460bfa1bc99df20ed719c7130557ee647398104,20d96559488265b929560030fd3d829ea33c90f8..0ade0113a3629dd828a23ad433d17e5964c95ac1
--- 1/tests/test_string.cpp
--- 2/tests/test_string.cpp
+++ b/tests/test_string.cpp
@@@ -49,8 -49,9 +49,9 @@@ class TestString : public CppUnit::Test
    CPPUNIT_TEST(testUpper);
    CPPUNIT_TEST(testEncodeNonLatin1);
    CPPUNIT_TEST(testEncodeEmpty);
+   CPPUNIT_TEST(testEncodeNonBMP);
    CPPUNIT_TEST(testIterator);
 -  CPPUNIT_TEST(testRedundantUTF8);
 +  CPPUNIT_TEST(testInvalidUTF8);
    CPPUNIT_TEST_SUITE_END();
  
  public: