Don't let PMS crash: download one item at a time

- PMS can currently not handle concurrent connections asking for
metadata (several PKC threads)
- Might also fix #75

README.md

@@ -18,9 +18,7 @@ I'm not in any way affiliated with Plex. Thank you very much for a small donatio
 
 ### IMPORTANT NOTES
 
-1. If your are using a **low CPU device like a raspberry pi or a CuBox**, PKC might be instable or crash during initial sync. Lower the number of threads in the [PKC settings under Sync Options](https://github.com/croneter/PlexKodiConnect/wiki/PKC-settings#sync-options):
-    - Limit artwork cache threads: 5
-    - Limit download sync threads: 1  
+1. If your are using a **low CPU device like a raspberry pi or a CuBox**, PKC might be instable or crash during initial sync. Lower the number of threads in the [PKC settings under Sync Options](https://github.com/croneter/PlexKodiConnect/wiki/PKC-settings#sync-options): `Limit artwork cache threads: 5`
 Don't forget to reboot Kodi after that.
 2. If you post logs, your **Plex tokens** might be included. Be sure to double and tripple check for tokens before posting any logs anywhere by searching for `token`
 3. **Compatibility**: PKC is currently not compatible with Kodi's Video Extras plugin. **Deactivate Video Extras** if trailers/movies start randomly playing. 

resources/lib/librarysync.py

@@ -287,7 +287,6 @@ class LibrarySync(Thread):
         self.vnodes = videonodes.VideoNodes()
         self.dialog = xbmcgui.Dialog()
 
-        self.syncThreadNumber = int(utils.settings('syncThreadNumber'))
         self.installSyncDone = True if \
             utils.settings('SyncInstallRunDone') == 'true' else False
         self.showDbSync = True if \
@@ -846,9 +845,8 @@ class LibrarySync(Thread):
         # Populate queue: GetMetadata
         for updateItem in self.updatelist:
             getMetadataQueue.put(updateItem)
-        # Spawn GetMetadata threads for downloading
+        # Spawn GetMetadata thread for downloading
         threads = []
-        for i in range(min(self.syncThreadNumber, itemNumber)):
         thread = ThreadedGetMetadata(getMetadataQueue,
                                      processMetadataQueue,
                                      getMetadataLock,

resources/settings.xml

@@ -40,7 +40,6 @@
 		<setting id="limitindex" type="number" label="30515" default="200" option="int" /><!-- Maximum items to request from the server at once -->
 		<setting id="enableTextureCache" label="30512"  type="bool" default="true" /> <!-- Force Artwork Caching -->
         <setting id="imageCacheLimit" type="enum" label="30513" values="Disabled|5|10|15|20|25" default="5" visible="eq(-1,true)" subsetting="true" /> <!-- Limit artwork cache threads -->
-		<setting id="syncThreadNumber" type="slider" label="39003" default="5" option="int" range="1,1,20"/>
 		<setting id="serverSync" type="bool" label="30514" default="true" visible="false"/><!-- Enable fast startup (requires server plugin) -->
 
 		<setting type="lsep" label="39052" /><!-- Background Sync -->