Implement addon upgrade mechanism

Author: AmineI

addon.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
-<addon id="plugin.program.steam.library" name="Steam Library" version="0.8.0" provider-name="aanderse">
+<addon id="plugin.program.steam.library" name="Steam Library" version="0.8.1" provider-name="aanderse">
     <requires>
         <import addon="xbmc.python" version="3.0.0" />
         <import addon="script.module.requests" version="2.18.4" />

resources/main.py

@@ -232,6 +232,22 @@ def main():
         # first time run, store version
         __addon__.setSetting('version', __addon__.getAddonInfo('version'))
 
+    else:
+        previous_version= __addon__.getSetting('version').split(".")
+        previous_version= list(map(int, previous_version))
+
+        new_version= __addon__.getSetting('version').split(".")
+        new_version= list(map(int,new_version))
+
+        if previous_version[0] == 0 & previous_version[1] < 8:
+            #Starting with 0.8.0, the cache encoding changed and previous caches needs to be reset.
+            delete_cache()
+
+        # Insert version upgrade mechanisms here before the following call
+
+        __addon__.setSetting('version', __addon__.getAddonInfo('version'))
+
+
     # prompt the user to configure the plugin with their steam details
     if not all_required_credentials_available():
         __addon__.openSettings()