Allow setting cursor blink for Terminal

[Gaming32]

The cursor blink can be configured for the terminal emulator by setting its device configuration on creation. However, it would be nice if this could be done for non-emulated terminals as well. xterm supports ?25l to disable blinking and ?25h to enable blinking. This is also supported on Windows's terminal when terminal emulation is enabled.

[Gaming32]

I was able to fulfill my use case for now by manually writing the appropriate escape sequences to the console.

[mabe02]

Yes, we should add that if it's part of the ANSI standard

[Gaming32]

I'm not sure if it's part of the ANSI standard, but it is in xterm. Both Windows Command Prompt and GNOME Terminal work with it.