Update Readme, Packages, Gulp + Config file = default ignore + RegEx in Config Ignores

[silaskoehler]

• update all NPM Packages
• update to Gulp 4
• update Readme file: Explain "ignores"
• update "Watcher.ts":
• add "/sync-config.json/" to default ignores
• add feature to set RegEx in config file, mainly to use relative file paths

(this my first github pull request, so i'm looking forward to feedback)