Replace 'Expand DRAM' option with dropdown menu (#32)

Allows to use mods that require a larger memory pool to allocate from.

src/Ryujinx.Headless.SDL2/HeadlessDynamicTextInputHandler.cs

@@ -18,7 +18,7 @@ namespace Ryujinx.Headless.SDL2
         public bool TextProcessingEnabled
         {
             get => Volatile.Read(ref _canProcessInput);
-            
+
             set
             {
                 Volatile.Write(ref _canProcessInput, value);

src/Ryujinx.Headless.SDL2/Options.cs

@@ -1,5 +1,6 @@
 using CommandLine;
 using Ryujinx.Common.Configuration;
+using Ryujinx.HLE;
 using Ryujinx.HLE.HOS.SystemState;
 
 namespace Ryujinx.Headless.SDL2
@@ -219,8 +220,8 @@ namespace Ryujinx.Headless.SDL2
 
         // Hacks
 
-        [Option("expand-ram", Required = false, Default = false, HelpText = "Expands the RAM amount on the emulated system from 4GiB to 8GiB.")]
-        public bool ExpandRAM { get; set; }
+        [Option("dram-size", Required = false, Default = MemoryConfiguration.MemoryConfiguration4GiB, HelpText = "Set the RAM amount on the emulated system.")]
+        public MemoryConfiguration DramSize { get; set; }
 
         [Option("ignore-missing-services", Required = false, Default = false, HelpText = "Enable ignoring missing services.")]
         public bool IgnoreMissingServices { get; set; }

src/Ryujinx.Headless.SDL2/Program.cs

@@ -562,7 +562,7 @@ namespace Ryujinx.Headless.SDL2
                 _userChannelPersistence,
                 renderer,
                 new SDL2HardwareDeviceDriver(),
-                options.ExpandRAM ? MemoryConfiguration.MemoryConfiguration8GiB : MemoryConfiguration.MemoryConfiguration4GiB,
+                options.DramSize,
                 window,
                 options.SystemLanguage,
                 options.SystemRegion,