Reworks to the shuffle system to improve performance and allow fast shuffling from a big library (but this work for all database views)

This improvement brings a huge performance improvement to start a random mix of your library. Previously, the only way to do this was to increase the size of a playlist with absurd sizes number. Now it will respect the limitation but will insert random songs from the current view.

Database: Add true random songs in playlist if it is gonna exceed its maximum capacity

More context is available here : https://www.reddit.com/r/rockbox/comments/1ez0mq4/i_developped_true_full_library_shuffle_for/

Also :
- Improved layout in the DB browser
- New default max playlists capacity is now 2000 on old PortalPlayer targets to give a better user experience and not having to wait dozens of seconds while creating a playlist
- "Show insert shuffled" option is now true by default
- Add a new shortcut to play all songs shuffled in the DB browser
- Now the feature is fully optional and enabled only on targets that have more than 2MB of RAM
- Add entries about this feature in the manual to explain it to the users
Change-Id: I1aebaf7ebcff2bf907080f1861027d530619097c

Change-Id: I3354923b148eeef1975171990e814a1a505d1df0

1 files changed, 14 insertions, 0 deletions

diff --git a/apps/lang/english.lang b/apps/lang/english.lang
index b0c7aed8f7..348f339239 100644
--- a/apps/lang/english.lang
+++ b/apps/lang/english.lang
@@ -2054,6 +2054,20 @@
   </voice>
 </phrase>
 <phrase>
+  id: LANG_RANDOM_SHUFFLE_RANDOM_SELECTIVE_SONGS_SUMMARY
+  desc: a summary splash screen that appear on the database browser when you try to create a playlist from the database browser that exceeds your system limit
+  user: core
+  <source>
+    *: "Selection too big, %d random tracks will be picked from it"
+  </source>
+  <dest>
+    *: "Selection too big, %d random tracks will be picked from it"
+  </dest>
+  <voice>
+    *: "Selection too big, fewer random tracks will be picked from it"
+  </voice>
+</phrase>
+<phrase>
   id: LANG_TAGCACHE_RAM
   desc: in tag cache settings
   user: core