Various bug fixes and small additions

IMPORTANT:
This commit contains new config options.
Make sure your local config file is up to date with config.example.toml to avoid issues.

CHANGELOG:
- Fix crash exploit caused by abnormally long WebSocket messages
- Added config option for limiting the maximum amount of active connections from the same IP
- Made per-IP turn limiter configurable
- Fixed an issue where vote updates were not sent to clients in some cases
- Added warning about using qmpSockDir on Windows hosts
- Updated dependencies
- Removed unused code/imports

src/IConfig.ts

@@ -6,6 +6,7 @@ export default interface IConfig {
         proxyAllowedIps : string[];
         origin : boolean;
         originAllowedDomains : string[];
+        maxConnections: number;
     };
     vm : {
         qemuArgs : string;
@@ -24,6 +25,10 @@ export default interface IConfig {
         usernameblacklist : string[];
         maxChatLength : number;
         maxChatHistoryLength : number;
+        turnlimit : {
+            enabled: boolean,
+            maximum: number;
+        };
         automute : {
             enabled: boolean;
             seconds: number;