Update DB to version 18: Machines can have an arbitrary number of memories,

so use an interconnection table, `memory_by_machine`.

Cicm.Database/Schemas/Enums.cs

@@ -77,4 +77,111 @@ namespace Cicm.Database.Schemas
         /// <summary>Videogame console</summary>
         Console = 2
     }
+
+    public enum MemoryType
+    {
+        /// <summary>Unknown memory type</summary>
+        Unknown = 0,
+        /// <summary>Dynamic RAM</summary>
+        DRAM = 1,
+        /// <summary>Fast page mode DRAM</summary>
+        FPM = 2,
+        /// <summary>Extended data out DRAM</summary>
+        EDO = 3,
+        /// <summary>Dual-ported video DRAM</summary>
+        VRAM = 4,
+        /// <summary>Synchronous DRAM</summary>
+        SDRAM = 5,
+        /// <summary>Double data rate SDRAM</summary>
+        DDR = 6,
+        /// <summary>Double data rate SDRAM v2</summary>
+        DDR2 = 7,
+        /// <summary>Double data rate SDRAM v3</summary>
+        DDR3 = 8,
+        /// <summary>Double data rate SDRAM v4</summary>
+        DDR4 = 9,
+        /// <summary>Rambus DRAM</summary>
+        RDRAM = 10,
+        /// <summary>Synchronous graphics RAM</summary>
+        SGRAM = 11,
+        /// <summary>Pseudostatic RAM</summary>
+        PSRAM = 12,
+        /// <summary>Static RAM</summary>
+        SRAM = 13,
+        /// <summary>Read-only memory</summary>
+        ROM = 14,
+        /// <summary>Programmable ROM</summary>
+        PROM = 15,
+        /// <summary>Erasable programmable ROM</summary>
+        EPROM = 16,
+        /// <summary>Electronically-erasable programmable ROM</summary>
+        EEPROM = 17,
+        /// <summary>NAND flash</summary>
+        NAND = 18,
+        /// <summary>NOR flash</summary>
+        NOR = 19,
+        /// <summary>Resistive RAM</summary>
+        ReRAM = 20,
+        /// <summary>Conductive-bridging RAM</summary>
+        CBRAM = 21,
+        /// <summary>Domain-wall memory</summary>
+        DWM = 22,
+        /// <summary>Nano-RAM</summary>
+        NanoRAM = 23,
+        /// <summary>Millipede memory</summary>
+        Millipede = 24,
+        /// <summary>Floating Junction Gate RAM</summary>
+        FJG = 25,
+        /// <summary>Punched paper</summary>
+        PunchedPaper = 26,
+        /// <summary>Drum memory</summary>
+        DrumMemory = 27,
+        /// <summary>Magnetic-core</summary>
+        MagneticCore = 28,
+        /// <summary>Plated wire memory</summary>
+        PlatedWire = 29,
+        /// <summary>Core rope memory</summary>
+        CoreRope = 30,
+        /// <summary>Thin-film memory</summary>
+        ThinFilm = 31,
+        /// <summary>Twistor memory</summary>
+        Twistor = 32,
+        /// <summary>Bubble memory</summary>
+        Bubble = 33
+    }
+
+    public enum MemoryUsage
+    {
+        /// <summary>Unknown usage</summary>
+        Unknown = 0,
+        /// <summary>
+        ///     Contains a boot loader (usually read-only) whose only function is to load the next memory (firmware or
+        ///     cartridge)
+        /// </summary>
+        Bootloader = 1,
+        /// <summary>
+        ///     Contains hardware initializing, some (or many) low level calls and code to load software from secondary
+        ///     storage
+        /// </summary>
+        Firmware = 2,
+        /// <summary>Memory used by software running on the machine</summary>
+        Work = 3,
+        /// <summary>Memory used by the graphics processing units</summary>
+        Video = 4,
+        /// <summary>Memory used by the sound synthetizers</summary>
+        Sound = 5,
+        /// <summary>Memory used to store wave tables</summary>
+        Wavetable = 6,
+        /// <summary>Memory used as a buffer from secondary storage</summary>
+        StorageBuffer = 7,
+        /// <summary>Memory used to save arbitrary data and possible also configuration</summary>
+        Save = 8,
+        /// <summary>Memory used to save only configuration</summary>
+        Configuration = 9,
+        /// <summary>
+        ///     Memory accessible directly to any of the processors in the machine, including graphics processors and sound
+        ///     synthetizers
+        /// </summary>
+        Unified = 10
+    }
 }