add flog and init it
add sk_print_err
add per-thread logger and fix the log config related bugs
add module name into module structure for logging purpose
fix log name
add O2 for ld
fix the compile due to flibs upgrading
add skull_api, include the SKULL_LOG_XXX first
upgrade flib to 0.6.3 and use the new sk_log_setcookie api
add error_log_template config item and rebuild the user sdk folder structure
add info|warn|error|fatal log templates support
add log templates files