Added simple assignment, read more

I was coding earlier this week, but my brain was so foggy I ended up not
knowing what I was doing. After a few days break, I've cleaned up the
mess, which took hours.

Changes:
* Variables can be assigned
* Added new value types as placeholders
* Added 'compare' and 'assign' to the AST
* Added duplicate opcode
* Added functions to copy and free values
* Max name length is 255 chars
* Compound assigns are squeezed into one word

To be completed:

* Tests for this commit's changes
* Compound assignments
* Variable access

source/toy_value.h

@@ -12,11 +12,12 @@ typedef enum Toy_ValueType {
 	TOY_VALUE_FLOAT,
 	TOY_VALUE_STRING,
 	TOY_VALUE_ARRAY,
-	TOY_VALUE_DICTIONARY,
+	TOY_VALUE_TABLE,
 	TOY_VALUE_FUNCTION,
 	TOY_VALUE_OPAQUE,
-
-	//TODO: type, any, consider 'stack' as a possible addition
+	TOY_VALUE_TYPE,
+	TOY_VALUE_ANY,
+	TOY_VALUE_UNKNOWN, //The correct value is unknown, but will be determined later
 } Toy_ValueType;
 
 //8 bytes in size
@@ -26,10 +27,8 @@ typedef struct Toy_Value {          //32 | 64 BITNESS
 		int integer;                //4  | 4
 		float number;               //4  | 4
 		struct Toy_String* string;  //4  | 8
-		//TODO: arrays
-		//TODO: dictonaries
-		//TODO: functions
-		//TODO: opaque
+		//TODO: more types go here
+		//TODO: consider 'stack' as a possible addition
 	} as;                           //4  | 8
 
 	Toy_ValueType type;             //4  | 4
@@ -41,7 +40,7 @@ typedef struct Toy_Value {          //32 | 64 BITNESS
 #define TOY_VALUE_IS_FLOAT(value)				((value).type == TOY_VALUE_FLOAT)
 #define TOY_VALUE_IS_STRING(value)				((value).type == TOY_VALUE_STRING)
 #define TOY_VALUE_IS_ARRAY(value)				((value).type == TOY_VALUE_ARRAY)
-#define TOY_VALUE_IS_DICTIONARY(value)			((value).type == TOY_VALUE_DICTIONARY)
+#define TOY_VALUE_IS_TABLE(value)				((value).type == TOY_VALUE_TABLE)
 #define TOY_VALUE_IS_FUNCTION(value)			((value).type == TOY_VALUE_FUNCTION)
 #define TOY_VALUE_IS_OPAQUE(value)				((value).type == TOY_VALUE_OPAQUE)
 
@@ -66,3 +65,5 @@ TOY_API bool Toy_private_isEqual(Toy_Value left, Toy_Value right);
 
 unsigned int Toy_hashValue(Toy_Value value);
 
+TOY_API Toy_Value Toy_copyValue(Toy_Value value);
+TOY_API void Toy_freeValue(Toy_Value value);