Complete builders, start work on using them

src/Discord.Net.Commands/Info/ParameterInfo.cs

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+using System;
+using System.Linq;
+using System.Threading.Tasks;
+
+using Discord.Commands.Builders;
+
+namespace Discord.Commands
+{
+    public class ParameterInfo
+    {
+        private readonly TypeReader _reader;
+
+        internal ParameterInfo(ParameterBuilder builder, CommandInfo command, CommandService service)
+        {
+            Command = command;
+
+            Name = builder.Name;
+            Summary = builder.Summary;
+            IsOptional = builder.Optional;
+            IsRemainder = builder.Remainder;
+            IsMultiple = builder.Multiple;
+
+            ParameterType = builder.ParameterType;
+            DefaultValue = builder.DefaultValue;
+
+            _reader = builder.TypeReader;
+        }
+
+        public CommandInfo Command { get; }
+        public string Name { get; }
+        public string Summary { get; }
+        public bool IsOptional { get; }
+        public bool IsRemainder { get; }
+        public bool IsMultiple { get; }
+        public Type ParameterType { get; }
+        public object DefaultValue { get; }
+
+        public async Task<TypeReaderResult> Parse(CommandContext context, string input)
+        {
+            return await _reader.Read(context, input).ConfigureAwait(false);
+        }
+
+        public override string ToString() => Name;
+        private string DebuggerDisplay => $"{Name}{(IsOptional ? " (Optional)" : "")}{(IsRemainder ? " (Remainder)" : "")}";
+    }
+}