server: Add remaining support for simple copy/paste

[soreau]

• Add function to set callback for client_cut_text
• Add server_cut_text structure and function

[any1]

Nice! The rest of the code has { on the same line as if and while. Can you fix that for this and the wayvnc PR also?

[any1]

Also, we don't use { } when there's only a single line in the code block, so prefer

if (stuff)
    do_stuff();

[soreau]

Nice! The rest of the code has { on the same line as if and while. Can you fix that for this and the wayvnc PR also? Also, we don't use { } when there's only a single line in the code block, so prefer

if (stuff)
    do_stuff();

These should be fixed now.

[soreau]

The length argument is necessary because we're not always guaranteed to be dealing with null terminated strings.

[any1]

Thanks!