Added something.

1. **Added** module 'Tune'. (src/Misc/Tune, test/TestTune)
    * Core.
    * Unit Test 'Tune'.
2. **Added** some funcs to module 'String'. (src/Structure/String)
    * **String_EqualN**
    * **String_EqualNChars**
3. **Added** some macros to src/Core/OO.h. 
    * **RAssert.** Use it to replace function assert.
    * **_DUMMY_ABORT**. RAssert depends on it.
4. **Added** new cflag. (CMakeFiles.txt)
    * **'-DNDEBUG'** flag to disable RAssert in release build. 
5. Module 'Base64' code standardization. (src/Misc/Base64, test/TestBase64)

That's all.