remove unused metro.pd

pd/doc/5.reference/metro.pd

-#N canvas 19 47 645 526 12;
-#X obj 32 291 metro 500;
-#X obj 70 9 metro;
-#X floatatom 101 268 4 0 0 0 - - -, f 4;
-#X msg 32 125 1;
-#X text 92 135 nonzero number or "bang" to start;
-#X msg 49 172 0;
-#X msg 38 148 bang;
-#X msg 49 194 stop;
-#X text 99 181 zero or "stop" to stop.;
-#X text 150 268 right inlet sets the rate in msec per tick.;
-#X text 377 471 Updated for Pd version 0.45;
-#X text 121 8 - metronome;
-#X text 23 35 The metro object sends a series of bangs at regular time
-intervals. The right inlet takes the value in milliseconds between
-each bang. The left inlet takes a 1 or 0 \, turning the metronome on
-or off.;
-#X obj 32 317 bng 25 250 50 0 empty empty empty 17 7 0 10 -262144 -1
--1;
-#X text 116 292 <-- optional creation arguments:;
-#X text 165 311 - delay time (float);
-#X text 166 329 - tempo (float) and time unit (symbol) as in "tempo"
-message, f 31;
-#X msg 51 220 tempo 2 msec;
-#X text 165 219 set tempo in units of miliseconds (msec for short)
-\, seconds (sec) \, minutes (min) or samples (samp)., f 51;
-#X text 79 472 see also:;
-#X obj 173 470 timer;
-#X text 41 373 for example \, a metronome at intervals of one beat
-at 120 beats per minute:, f 37;
-#X obj 360 395 metro 1 120 permin;
-#X obj 360 373 tgl 15 0 empty empty empty 17 7 0 10 -262144 -1 -1 0
-1;
-#X obj 360 420 bng 25 250 50 0 empty empty empty 17 7 0 10 -262144
--1 -1;
-#X obj 220 435 delay;
-#X text 50 428 for details on tempo setting \, see:, f 20;
-#X connect 0 0 13 0;
-#X connect 2 0 0 1;
-#X connect 3 0 0 0;
-#X connect 5 0 0 0;
-#X connect 6 0 0 0;
-#X connect 7 0 0 0;
-#X connect 17 0 0 0;
-#X connect 22 0 24 0;
-#X connect 23 0 22 0;