[Open Assets] srb2srv - SRB2 Server CLI

New update gives some significant changes to the script:

• Replacing SRB2 Master Server Browser URL to ms.srb2.org .
• Replacing code to be compatible with ms.srb2.org, which greatly improves speed of web scraping from Master Server, and as an end result, faster displaying list of servers.
• Removing dependency for Puppeteer and Node.
• Fixing issue with displaying some colors in server names.
• Adding support for running SRB2 and SRB2Kart flatpaks. You can set environment variable in shell configuration file with: export SRB2="flatpak" and export SRB2KART="flatpak", if flatpaks are installed.
• Adding error messages.

• Fixing issue of files not adding to filelist, when using tilde as shortcut to home directory in path.
• Removing more useless part of code.

• Fixing issue with some loops not exiting, when pressing enter.
• Removing unnecessary pipes and other stuff in code.

• Fixes to issue with addons not adding to filelist, when using "--port" option.

• Added "--port" option. Now you can specify the local UDP port to use. Works with "--checkport", "--dedicated", "--dedicatedkart", "--server" and "--serverkart" options.

• Added support for macOS. Install with sudo make install. Further install instructions for macOS users are available in description.
• Another fixes for issues with space separated paths.

• Fixing issue with word splitting, if user have space separated directory names in path.
• Added manual script installation for Windows users, since "sudo make install" is not working well for Windows.