Add support for additional alpha when the term-window is not focused

st.h

@@ -82,6 +82,7 @@ typedef union {
 
 void die(const char *, ...);
 void redraw(void);
+void tfulldirt(void);
 void draw(void);
 
 void externalpipe(const Arg *);
@@ -138,4 +139,5 @@ extern unsigned int tabspaces;
 extern unsigned int defaultfg;
 extern unsigned int defaultbg;
 extern float alpha;
+extern float alphaUnfocus;
 extern const int boxdraw, boxdraw_bold, boxdraw_braille;