Instantbird support for Tor Launcher

I thought we should get this started!

I have attached the trivial patch that adds support for Instantbird to Tor Launcher. I have tested it and it is working fine, except for this message in the error console:

[10-15 23:11:37] TorLauncher NOTE: _parseBootstrapStatus: missing BOOTSTRAP

Seems like we can ignore this safely?

Note that there are some other things that we will probably tweak later, such as minVersion and maxVersion but this patch takes care of the important stuff first.

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