Fix IDD_DIALOG_ABOUT

Fix #16.
Add about dlg to toolbar

Fix #16.
Add zlib to about dlg
Add zlib to about dlg

Fix #16.
Merge branch 'fix-dlg-about' of https://github.com/tbeu/SynFTP into fix-dlg-about
Merge pull request #21 from tbeu/fix-dlg-about

Fix dlg about