Add storage/type settings to control file tree vs sqlite storage

src/main/resources/configuration.txt

@@ -15,6 +15,13 @@
 #   The definitions of these templates are in normal-hi_boost_xhi.txt, nether-hi_boost_xhi.txt, and the_end-hi_boost_xhi.txt
 deftemplatesuffix: vlowres
 
+storage:
+  # Filetree storage (standard tree of image files for maps)
+  type: filetree
+  # SQLite db for map storage (uses dbfile as storage location)
+  #type: sqlite
+  #dbfile: dynmap.db
+  
 components:
   - class: org.dynmap.ClientConfigurationComponent