misc/kforth: Add system status, work on vocab, better write_num.

- Now system structure includes a status variable and an associated
  function for writing the status out.
- Adding more words to the builtin dictionary.
- write_num round 3.
- Include option to not print the stack each iteration.

linux/defs.h

@@ -5,6 +5,8 @@
 #include <stdint.h>
 
 typedef int32_t KF_INT;
+typedef int64_t	KF_LONG;
+
 constexpr uint8_t	STACK_SIZE = 128;
 
 #endif

linux/io.h

@@ -17,6 +17,8 @@ public:
 	// Line I/O
 	bool	rdln(char *buf, size_t len, size_t *readlen);
 	void	wrln(char *buf, size_t len);
+	
+	void	newline(void) { this->wrch('\n'); };
 private:
 };