refactor: Entire code base, thread and log usage

Boils down to:
- Include headers
- Reduce boiler plate with helpers
- Swap out explicit usages with core API layer
  and ensure the right API is configured beforehand

src/main/cconfig/conf.c

@@ -6,8 +6,9 @@
 
 #include "cconfig/conf.h"
 
+#include "core/log.h"
+
 #include "util/fs.h"
-#include "util/log.h"
 #include "util/str.h"
 
 enum cconfig_conf_error cconfig_conf_load_from_file(