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/Database/MySQL/gaseous-1001.sql

@@ -69,11 +69,11 @@ CREATE TABLE `RomCollections` (
   `Id` BIGINT NOT NULL AUTO_INCREMENT,
   `Name` VARCHAR(255) NULL,
   `Description` LONGTEXT NULL,
-  `Platforms` JSON NULL,
-  `Genres` JSON NULL,
-  `Players` JSON NULL,
-  `PlayerPerspectives` JSON NULL,
-  `Themes` JSON NULL,
+  `Platforms` longtext NULL,
+  `Genres` longtext NULL,
+  `Players` longtext NULL,
+  `PlayerPerspectives` longtext NULL,
+  `Themes` longtext NULL,
   `MinimumRating` INT NULL,
   `MaximumRating` INT NULL,
   `MaximumRomsPerPlatform` INT NULL,