Add MariaDB support (#156)

* Fixed startup db check

* Relation tables are created automatically for IGDB metadata

* Removed JSON dependency from filters

* Removed JSON searches from Game library queries

* Gaseous now runs without error on MariaDB

* Fixed static database name bug

* Updated docker files and README

gaseous-tools/Config.cs

@@ -1,6 +1,5 @@
 using System;
 using System.Data;
-using Google.Protobuf.WellKnownTypes;
 using Newtonsoft.Json;
 using IGDB.Models;
 
@@ -313,6 +312,16 @@ namespace gaseous_tools
                         return dbConnString;
                     }
                 }
+
+                [JsonIgnore]
+                public string ConnectionStringNoDatabase
+                {
+                    get
+                    {
+                        string dbConnString = "server=" + HostName + ";port=" + Port + ";userid=" + UserName + ";password=" + Password + ";";
+                        return dbConnString;
+                    }
+                }
             }
 
             public class Library