add libfmt to replace current logging mechanism

Signed-off-by: Amneesh Singh <natto@weirdnatto.in>

src/util/log.cc

@@ -1,49 +0,0 @@
-#include "log.hh"
-
-namespace logging {
-
-namespace ansi {
-static const char* RED     = "\033[31m";
-static const char* YELLOW  = "\033[33m";
-static const char* MAGENTA = "\033[35m";
-static const char* WHITE   = "\033[37m";
-static const char* BOLD    = "\033[1m";
-static const char* RESET   = "\033[0m";
-}
-
-Logger::Logger(std::ostream& os)
-  : os(os){};
-
-void
-Logger::set_level(Level level) {
-    switch (level) {
-        case Level::Debug:
-            os << ansi::MAGENTA << ansi::BOLD << "[DEBUG] ";
-            break;
-
-        case Level::Info:
-            os << ansi::WHITE << "[INFO] ";
-            break;
-
-        case Level::Warn:
-            os << ansi::YELLOW << "[WARN] ";
-            break;
-
-        case Level::Error:
-            os << ansi::RED << ansi::BOLD << "[ERROR] ";
-            break;
-
-            // unreachable
-        default: {
-        }
-    }
-}
-
-void
-Logger::reset_level() {
-    os << ansi::RESET;
-}
-}
-
-// Global logger
-logging::Logger logger;