rework media layout (#22)

* replace media items tables with card grids

* style cleanup

* add basic paging

* sort and page in the db

* optimize sql for movies

* support movie posters

* resize movie posters and store in cache with channel logos

* fix bug preventing folders with more than 50 chars as local media sources

* support tv posters

ErsatzTV.Infrastructure/Data/TvContext.cs

@@ -32,6 +32,7 @@ namespace ErsatzTV.Infrastructure.Data
         // support raw sql queries
         public DbSet<MediaCollectionSummary> MediaCollectionSummaries { get; set; }
         public DbSet<GenericIntegerId> GenericIntegerIds { get; set; }
+        public DbSet<MediaItemSummary> MediaItemSummaries { get; set; }
 
         protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder) =>
             optionsBuilder.UseLoggerFactory(_loggerFactory);
@@ -39,6 +40,11 @@ namespace ErsatzTV.Infrastructure.Data
         protected override void OnModelCreating(ModelBuilder builder)
         {
             base.OnModelCreating(builder);
+
+            builder.Ignore<MediaCollectionSummary>();
+            builder.Ignore<GenericIntegerId>();
+            builder.Ignore<MediaItemSummary>();
+
             builder.ApplyConfigurationsFromAssembly(typeof(TvContext).Assembly);
         }
     }