add event 'onPlayerRequestMods', restructure modloading

now every player has their own list of allowed client mods, this can be modified by lua upon joining and is later used as a whitelist to ensure only those files can be sent to each client

include/Common.h

@@ -55,6 +55,7 @@ constexpr std::string_view StrLogChat = "LogChat";
 constexpr std::string_view StrSendErrors = "Misc.SendErrors";
 constexpr std::string_view StrSendErrorsMessageEnabled = "Misc.SendErrorsShowMessage";
 constexpr std::string_view StrHideUpdateMessages = "Misc.ImScaredOfUpdates";
+constexpr std::string_view StrIncludeSubdirectories = "Misc.IncludeSubdirectories";
 
 // HTTP
 constexpr std::string_view StrHTTPServerEnabled = "HTTP.HTTPServerEnabled";
@@ -79,6 +80,9 @@ struct Version {
 template <typename T>
 using SparseArray = std::unordered_map<size_t, T>;
 
+template <typename K, typename V>
+using HashMap = std::unordered_map<K, V>;
+
 using boost::variant;
 using boost::container::flat_map;