patch 8.0.0210: no support for bracketed paste

Problem:    Vim does not support bracketed paste, as implemented by xterm and
            other terminals.
Solution:   Add t_BE, t_BD, t_PS and t_PE.
diff --git a/src/evalfunc.c b/src/evalfunc.c
index c7be082..da22354 100644
--- a/src/evalfunc.c
+++ b/src/evalfunc.c
@@ -4231,7 +4231,7 @@
     {
 	if (argvars[0].v_type == VAR_UNKNOWN)
 	    /* getchar(): blocking wait. */
-	    n = safe_vgetc();
+	    n = plain_vgetc();
 	else if (get_tv_number_chk(&argvars[0], &error) == 1)
 	    /* getchar(1): only check if char avail */
 	    n = vpeekc_any();
@@ -4240,7 +4240,7 @@
 	    n = 0;
 	else
 	    /* getchar(0) and char avail: return char */
-	    n = safe_vgetc();
+	    n = plain_vgetc();
 
 	if (n == K_IGNORE)
 	    continue;