Some improvements and fixes specifically for VisualC

[zhk]

Changes for showfont:

• Added argument [-windowsize w,h] to specify the windows size.
• added argument [-utf8txtfile pathName] to support message from utf8 file.
• removed [-utf8|-unicode], since the utf8 or unicode text cannot be input from console.
• fixed [-wrapped] display.
• Set window title.

Other changes:

• Added relative paths(include and link) for VisualC projects.
• Set SubSystem:Console for glfont and showfont.