Update sp_SP.lang
upnp: If item is missing 'url' just skip it

Fixes #2000
Always open backends from navigator in a new thread

This reduces some code duplication and also avoid some annoying
problems where the UI would lock for a while
rpi: Remove 'experimental warning' from configure.rpi
upnp: browse does not need to create a thread anymore since navigator does that already
hls: Fix recently introduced memory leak (libav10 upgrade)
subtitles: Fix double free() for ttml subs
Don't decode more than 2 frames when trying to figure out FPS

Fixes #2013
Make kvstore a bit bigger
ps3: Since we have virtual RAM mapped now, increase sqlite soft heap limit to 10MB
Merge pull request #161 from aldostools/patch-5

Update sp_SP.lang
rpi/stos: Kill spash screen on startup
rpi/stos: Only kill framebuffer (by turning off TV hack) if it's around
bspatch: Make sure data is null terminated
str: Make the find_str() public
upgrade: Add support for partial upgrade of files with '# BEGIN SHOWTIME CONFIG' markers
If we're on STOS, don't write restart position updates to db while playing.

It will wear out flash cards too fast