vt: implement C0::FF - processed in the same way as C0::LF

CHANGELOG.md

@@ -23,6 +23,7 @@
     whether the cursor should blink or not by default. Note that
     applications can override this.
 * Multi-seat support
+* Implemented `C0::FF` (form feed)
 
 
 ### Changed

vt.c

@@ -148,8 +148,10 @@ action_execute(struct terminal *term, uint8_t c)
 
     case '\n':
     case '\v':
+    case '\f':
         /* LF - \n - line feed */
         /* VT - \v - vertical tab */
+        /* FF - \f - form feed */
         term_linefeed(term);
         break;