[SHELL32]: CShellLink fixups Part 1:

[SHELL32]: CShellLink fixups Part 1:
- Use STDMETHODCALLTYPE for the interface methods calling convention;
- Use the naming convention "m_Member" for the class members (note that I haven't applied the convention for some members: because they will go away in the next commits);
- Use _countof() where needed;
- Make the ANSI CShellLink::GetIconLocation call the UNICODE version;
- Move some functions around to put them closer to the functions that call them;
- Very minor code formatting.
CORE-12682

svn path=/trunk/; revision=73573