[player/input] Refactor - WIP

* Open input sources earlier
* Gapless playback
* Remove fixed 44100/16 from player
* Complete restructure player internals

src/misc.h

@@ -21,6 +21,11 @@
 # define MIN(a, b) ((a < b) ? a : b)
 #endif
 
+#ifndef MAX
+#define MAX(a, b) ((a > b) ? a : b)
+#endif
+
+
 // Remember to adjust quality_is_equal() if adding elements
 struct media_quality {
   int sample_rate;