Recent updates in storage (#667)

* Fix error handling in Torrent.cpp, improve choosing peers for upload

* Various improvements in storage daemon

"get-pieces-info"
Store "added at"
Improve calculating up/down speed
Improve TL protocol for future compatibility
Remove empty directories on "--remove-files"
Better windows support
Debug logs in PeerActor
More restrictions on TorrentInfo
Bugfixes

* Global speed limits for download and upload

+bugfix

* Reset download/upload speed on changing settings or completion

* Exclude some system files in TorrentCreator

storage/LoadSpeed.cpp

@@ -31,13 +31,17 @@ double LoadSpeed::speed(td::Timestamp now) const {
   update(now);
   return (double)total_size_ / duration(now);
 }
+void LoadSpeed::reset() {
+  events_ = {};
+  total_size_ = 0;
+}
 
 td::StringBuilder &operator<<(td::StringBuilder &sb, const LoadSpeed &speed) {
   return sb << td::format::as_size(static_cast<td::uint64>(speed.speed())) << "/s";
 }
 
 void LoadSpeed::update(td::Timestamp now) const {
-  while (duration(now) > 30) {
+  while (duration(now) > 10) {
     total_size_ -= events_.front().size;
     events_.pop();
   }