docs: add doxygen (#1004)

src/main.h

@@ -1,17 +1,23 @@
-// Created by loki on 12/22/19.
+/**
+ * @file main.h
+ */
 
+// macros
 #ifndef SUNSHINE_MAIN_H
 #define SUNSHINE_MAIN_H
 
+// standard includes
 #include <filesystem>
 #include <string_view>
 
+// lib includes
+#include <boost/log/common.hpp>
+
+// local includes
 #include "thread_pool.h"
 #include "thread_safe.h"
 
-#include <boost/log/common.hpp>
-
-extern util::ThreadPool task_pool;
+extern thread_pool_util::ThreadPool task_pool;
 extern bool display_cursor;
 
 extern boost::log::sources::severity_logger<int> verbose;
@@ -21,15 +27,15 @@ extern boost::log::sources::severity_logger<int> warning;
 extern boost::log::sources::severity_logger<int> error;
 extern boost::log::sources::severity_logger<int> fatal;
 
+// functions
+int main(int argc, char *argv[]);
 void log_flush();
-
 void print_help(const char *name);
-
 std::string read_file(const char *path);
 int write_file(const char *path, const std::string_view &contents);
-
 std::uint16_t map_port(int port);
 
+// namespaces
 namespace mail {
 #define MAIL(x)                         \
   constexpr auto x = std::string_view { \
@@ -41,10 +47,8 @@ extern safe::mail_t man;
 // Global mail
 MAIL(shutdown);
 MAIL(broadcast_shutdown);
-
 MAIL(video_packets);
 MAIL(audio_packets);
-
 MAIL(switch_display);
 
 // Local mail
@@ -53,5 +57,6 @@ MAIL(idr);
 MAIL(rumble);
 MAIL(hdr);
 #undef MAIL
+
 } // namespace mail
 #endif // SUNSHINE_MAIN_H