feat: add player name configuration and rename config file

- Add --player command-line argument and 'player' field in Arguments struct
- Rename ip.toml to server.toml and corresponding internal variable to 'server'
- Fix block.cpp source path in CMakeLists.txt

CMakeLists.txt

@@ -136,7 +136,7 @@ add_executable(${PROJECT_NAME}
     src/gameplay/builders/snowy_plain_builder.cpp
     src/gameplay/river_worm.cpp
     src/gameplay/river_path.cpp
-    src/block.cpp
+    src/gameplay/block.cpp
     src/gameplay/vertex_data.cpp
     src/gameplay/builders/ocean_builder.cpp
     src/gameplay/network_server.cpp