Reorganize code and remove hack for empty block outputs

src/x11.c

@@ -0,0 +1,23 @@
+#include "x11.h"
+
+#include <X11/Xlib.h>
+
+static Display *display;
+static Window rootWindow;
+
+int setupX() {
+    display = XOpenDisplay(NULL);
+    if (!display) {
+        return 1;
+    }
+
+    rootWindow = DefaultRootWindow(display);
+    return 0;
+}
+
+int closeX() { return XCloseDisplay(display); }
+
+void setXRootName(char *str) {
+    XStoreName(display, rootWindow, str);
+    XFlush(display);
+}