[BOARD/PACKAGE] add FFMPEG to record&play /dev/fb0 + alsa capture (#48)

* [PACKAGE] downgrade FFMPEG(add) & X264
- use ffmpeg-3.1 thus downgrade ver. to working SDL1.2
- downgrade x264 to be inline with former ffmpeg
- uncomment FFSERVER build instructions (it is available in 3.1 version)

* [BOARD] 
- add `ffplay` & `ffmpeg` apps to record&play
- add `arecord` script for AUDIO capture (use alsaloop workaround)
- update appLinks with "params=&" for bg launch
- use `pkill` instead 'killall` for scripts (warning: it also checks for bash running under the same name)
- use FFPROBE to detect media format in `ffplay`
- for X264  use sources.buildroot.net (code.videolan.org src only works with git method)
- rm redundant usb Applink
- add 0003-ffplay-custom-sdlk.patch (to make hotkeys usable in miyoo)

board/miyoo/main/apps/arecord/audio_record.sh

@@ -0,0 +1,18 @@
+#!/bin/sh
+
+if pgrep "arecord" > /dev/null; then
+	killall arecord
+	while (pgrep "arecord"); do
+		sleep 1
+	done
+	rmmod snd-aloop.ko
+	rm /mnt/.asoundrc
+	alsactl init
+else
+#WARNING: This disables audio output to speakers by redirecting it to alsaloop capturing device's card
+	echo 'pcm.!default { type plug slave.pcm "hw:Loopback,0,0" }' > /mnt/.asoundrc
+	modprobe snd-aloop.ko
+	alsactl init
+	mkdir -p /mnt/output
+	arecord -q -c2 -D hw:Loopback,1,0 -f S16_LE "/mnt/output/audio_$(date +%Y%m%d%H%M%S).wav"
+fi