main: initialize signal handling before other parts of the editor

There is a period during vis' initialization where our signal handler
is not yet registered and we potentially lose not handled signals.
This time window is dependent on the lua code executed during
the EVENT_INIT event and can be arbitrary long dependent of the user's
config.

Decrease the window for lost signals by registering our signal handler
and blocking the signals for the rest of the editor's startup
immediately after parsing the command options.

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