WIP: remove the old database abstraction layer

remove such classes:
- DbBase
- DbConn
- DbTextStream
- Db

while here:
- remove: TextStream, SLog, TexTextStream

winixd/core/misc.h

@@ -996,16 +996,6 @@ void JSONescapeStream(const std::wstring & in, pt::WTextStream & out);
 
 
 
-/*
- * converting from a wide string to an UTF-8 string
- * and puts a log if the conversion fails
- *
- * it uses pt::wide_to_utf8()
- */
-bool wide_to_utf8(const wchar_t * wide_string,      char * utf8, size_t utf8_size);
-bool wide_to_utf8(const std::wstring & wide_string, char * utf8, size_t utf8_size);
-
-
 /*
  * calculate diff between start and stop timespec
  *