Macro hc_print_th

macro_rules! hc_print_th {
    ( $( $arg:tt )* ) => { ... };
}

Similar to hc_print!(), that can be used from spawned threads to print to the active Hexchat window. Use hc_print() if printing from the main thread.

use hexchat_api::hc_print_th;
hc_print_th!(fmt, argv, ..);
hc_print_th!(arg);
```c
# Arguments
* `ctx=(network, channel)` - Sets the context to print in.
* `fmt`     - The format string.
* `argv`    - The varibale length formatted arguments.