Move opt_* into same file as main()/run()

This commit is purely about reducing externs and LOC.  If the main and
run functions ever move elsewhere (which will probably make sense
eventually), these should come along with them.

Signed-off-by: Devin J. Pohly <djpohly@gmail.com>

st.h

@@ -9,6 +9,7 @@
 #define LEN(a)			(sizeof(a) / sizeof(a)[0])
 #define BETWEEN(x, a, b)	((a) <= (x) && (x) <= (b))
 #define DIVCEIL(n, d)		(((n) + ((d) - 1)) / (d))
+#define DEFAULT(a, b)		(a) = (a) ? (a) : (b)
 #define LIMIT(x, a, b)		(x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
 #define ATTRCMP(a, b)		((a).mode != (b).mode || (a).fg != (b).fg || \
 				(a).bg != (b).bg)
@@ -194,7 +195,7 @@ void tnew(int, int);
 void tresize(int, int);
 void tsetdirt(int, int);
 void tsetdirtattr(int);
-void ttynew(void);
+void ttynew(char *, char *, char **);
 size_t ttyread(void);
 void ttyresize(int, int);
 void ttysend(char *, size_t);
@@ -221,14 +222,6 @@ extern Term term;
 extern Selection sel;
 extern int cmdfd;
 extern pid_t pid;
-extern char **opt_cmd;
-extern char *opt_class;
-extern char *opt_embed;
-extern char *opt_font;
-extern char *opt_io;
-extern char *opt_line;
-extern char *opt_name;
-extern char *opt_title;
 extern int oldbutton;
 
 /* config.h globals */