Tests: Modularize unit testing

Split unit tests into separate files under src/unittest/
Give better unittest diagnostics
Clean up some code

src/CMakeLists.txt

@@ -278,13 +278,9 @@ add_custom_target(GenerateVersion
 add_subdirectory(jthread)
 add_subdirectory(network)
 add_subdirectory(script)
+add_subdirectory(unittest)
 add_subdirectory(util)
 
-
-set (unittests_SRCS
-	test.cpp
-)
-
 set(common_SRCS
 	ban.cpp
 	cavegen.cpp
@@ -360,7 +356,7 @@ set(common_SRCS
 	${JTHREAD_SRCS}
 	${common_SCRIPT_SRCS}
 	${UTIL_SRCS}
-	${unittests_SRCS}
+	${UNITTEST_SRCS}
 )