Reorganize code and remove hack for empty block outputs

inc/block.h

@@ -0,0 +1,19 @@
+#pragma once
+#define _GNU_SOURCE
+
+#include "config.h"
+
+typedef struct {
+    const char *command;
+    const unsigned int interval;
+    const unsigned int signal;
+    int pipe[2];
+    char output[CMDLENGTH * 4 + 1];
+} Block;
+
+extern Block blocks[];
+extern const unsigned short blockCount;
+
+void execBlock(const Block *, const char *);
+void execBlocks(unsigned int);
+void updateBlock(Block *);