Added address literals

I don't know why someone would want to use a pointer literal in a
script, but now you can because there's an opcode for it and fuck it.

ssc/ast/nodes.literals.cs

@@ -52,6 +52,21 @@ namespace arookas {
 		}
 	}
 
+	class sunAddressLiteral : sunToken<uint>, sunTerm {
+		public sunAddressLiteral(sunSourceLocation location, string literal)
+			: base(location) {
+				Value = UInt32.Parse(literal.Substring(1), NumberStyles.AllowHexSpecifier);
+		}
+
+		public override void Compile(sunCompiler compiler) {
+			compiler.Binary.WriteADR(Value);
+		}
+
+		sunExpressionFlags sunTerm.GetExpressionFlags(sunContext context) {
+			return sunExpressionFlags.Literals;
+		}
+	}
+
 	class sunStringLiteral : sunToken<string>, sunTerm {
 		public sunStringLiteral(sunSourceLocation location, string literal)
 			: base(location) {

ssc/parser.cs

@@ -93,6 +93,7 @@ namespace arookas {
 				case __sunConstants.INT_NUMBER: return new sunIntLiteral(location, token);
 				case __sunConstants.HEX_NUMBER: return new sunHexLiteral(location, token);
 				case __sunConstants.DEC_NUMBER: return new sunFloatLiteral(location, token);
+				case __sunConstants.ADR_NUMBER: return new sunAddressLiteral(location, token);
 				case __sunConstants.STRING: return new sunStringLiteral(location, token);
 				case __sunConstants.IDENTIFIER: return new sunIdentifier(location, token);
 				case __sunConstants.ELLIPSIS: return new sunEllipsis(location);

ssc/sunscript.grammar

@@ -94,6 +94,7 @@ IDENTIFIER								= <<[_A-Za-z][_A-Za-z0-9]*>>
 DEC_NUMBER								= <<-?[0-9]+\.[0-9]+>>
 HEX_NUMBER								= <<-?0x[0-9A-Fa-f]+>>
 INT_NUMBER								= <<-?[0-9]+>>
+ADR_NUMBER								= <<\$[0-9A-Fa-f]{8}>>
 STRING										= <<"(\\.|[^"])*">>
 
 %productions%