Library filtering and display enhancements (#214)

* Implement infinite scrolling and paging (selected via preference) (closes #202)
* Display game counts on more filter types (closes #194)
* Make game counts larger (closes #194)
* Include age groups in filtering (closes #200)
* Add sorting options (closes #145)

gaseous-server/Classes/Auth/Models/ProfileViewModel.cs

@@ -7,6 +7,7 @@ namespace Authentication
         public string EmailAddress { get; set; }
         public List<String> Roles { get; set; }
         public SecurityProfileViewModel SecurityProfile { get; set; }
+        public List<UserPreferenceViewModel> UserPreferences { get; set; }
         public string HighestRole {
             get
             {

gaseous-server/Classes/Auth/Models/SecurityProfileViewModel.cs

@@ -5,13 +5,13 @@ namespace Authentication
     public class SecurityProfileViewModel
     {
         public AgeRestrictionItem AgeRestrictionPolicy { get; set; } = new AgeRestrictionItem{ 
-            MaximumAgeRestriction = "Adult",
+            MaximumAgeRestriction = gaseous_server.Classes.Metadata.AgeRatings.AgeGroups.AgeRestrictionGroupings.Adult,
             IncludeUnrated = true 
         };
 
         public class AgeRestrictionItem
         {
-            public string MaximumAgeRestriction { get; set; }
+            public gaseous_server.Classes.Metadata.AgeRatings.AgeGroups.AgeRestrictionGroupings MaximumAgeRestriction { get; set; }
             public bool IncludeUnrated { get; set; }
         }
     }

gaseous-server/Classes/Auth/Models/UserPreferenceViewModels.cs

@@ -0,0 +1,8 @@
+namespace Authentication;
+
+public class UserPreferenceViewModel
+{
+    public string Setting { get; set; }
+
+    public string Value { get; set; }
+}