implement player poses (sneak/sprint)

* Added sending player metadata with poses to everyone

* Renamed sendPlayerMetadataToAll to broadcastPlayerMetadata

* Made entity metadata system flexible

* Made broadcastPlayerMetadata create new metadata instead of using a global one

* Moved writeEntityData, sizeEntityData and sizeEntityMetadata to procedures

* style nitpicks

---------

Co-authored-by: p2r3 <p2r3@p2r3.com>

src/tools.c

@@ -120,7 +120,7 @@ ssize_t send_all (int client_fd, const void *buf, ssize_t len) {
       if (err == WSAEWOULDBLOCK || err == WSAEINTR) {
     #else
     if (errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK) {
-    #endif  
+    #endif
       // handle network timeout
       if (get_program_time() - last_update_time > NETWORK_TIMEOUT_TIME) {
         disconnectClient(&client_fd, -2);