[MSGINA]: Code style fixes:

[MSGINA]: Code style fixes:
- Use explicit unicode functions;
- Just use the hdc field of the PAINTSTRUCT initialized by BeginPaint instead of introducing yet another hdc variable;
- Use SetDlgItemTextW instead of GetDlgItem + SetWindowTextW;
- Don't hardcode buffer sizes in functions calls;
- Use _countof instead of sizeof(foo)/sizeof(foo[0]);
- Avoid using raw 'int' variables where possible;
- Remove trailing whitespace.
...

svn path=/trunk/; revision=72718