PictureFlow: Minor fixes & changed defaults

- Fix FPS counter overlapping
the artist string when
"Show album title" was set to
"Show album and artist at the top"

- Fix disappearance of center album
if certain Settings menus had been
accessed while list of tracks was
showing and you then returned to the
list of albums

- Fix disappearing album artwork after
cache had been created until you started
scrolling

- Enable context menu even if WPS
integration is disabled

- Make splash screen appear only
on first launch and for database
updates, when it is actually on screen
for long enough

- Eliminate 'Loading' splash if tagcache
is in RAM

- Show both album and artist by default on
displays whose height > 100px

Change-Id: Ie70c0d9093789294d288a4f88338ee4a588bf4a5

apps/tagcache.h

@@ -246,6 +246,7 @@ void tagcache_screensync_event(void);
 void tagcache_screensync_enable(bool state);
 
 #ifdef HAVE_TC_RAMCACHE
+bool tagcache_is_in_ram(void);
 #ifdef HAVE_DIRCACHE
 bool tagcache_fill_tags(struct mp3entry *id3, const char *filename);
 #endif