TODO

2021.01.24:
v WebSockets URL to command line argument (2021.02.03)
v Command line arguments for extension IDs (2021.02.03)
v How to wait until all messages are sent before closing the WS connection (2021.01.31)

2021.01.30:
v `string=` (2021.01.30)
v `unwind-protect` `with-` macro to close the connection (2021.01.31)
v wait-group (2021.01.31)
v `remove` in `filter` (2021.01.30)
- Release build with ECL

2021.01.31:
v sysexits (2021.02.13)
v Timeout (2021.02.14)

2021.02.02:
v Option to reload current tab (run `chrome.tabs.reload()` in the last target) (2021.02.08)
v Config object (2021.02.02)

2021.02.03:
v Correct call ID numbering when multiple extensions are given (2021.02.03)
v Catch errors from all signals and print the error message instead of opening the debugger (2021.02.05)

2021.02.08:
x Find out if we can take a port number only instead of a full WebSocket URL (2021.02.14)

2021.02.14:
- Clean up code
- Documentation
- Tab reload not working consistently
- Remove or hide debug output