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/test/cconfig/Module.mk

@@ -3,6 +3,7 @@ testexes            += cconfig-test
 srcdir_cconfig-test := src/test/cconfig
 
 libs_cconfig-test     := \
+    core \
     cconfig \
     test \
     util \
@@ -17,6 +18,7 @@ testexes            += cconfig-util-test
 srcdir_cconfig-util-test := src/test/cconfig
 
 libs_cconfig-util-test     := \
+    core \
     cconfig \
     test \
     util \
@@ -31,6 +33,7 @@ testexes            += cconfig-cmd-test
 srcdir_cconfig-cmd-test := src/test/cconfig
 
 libs_cconfig-cmd-test     := \
+    core \
     cconfig \
     test \
     util \