Support $TZ environment variable pointing to timezone data file

[ImNtReal]

• I have searched open and closed issues for duplicates

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Bug Description

Opening the preferences window in 1.20.0 results in a blank window.

Steps to Reproduce

1. rm -rf ~/.config/Signal
2. relink Signal
3. Open Preferences window

Actual Result:
Window opens blank.

Expected Result:
Text and options should be displayed.

Screenshots

Platform Info

Signal Version: 1.20.0
Operating System: Arch Linux
Linked Device Version: Android 9 January 5, 2019

Link to Debug Log

The log entry that I think this may be coming from is:
ERROR 2019-01-25T13:44:23.375Z Top-level unhandled promise rejection: RangeError: Unsupported time zone specified undefined

https://debuglogs.org/9dc6497896c318437c0fc46df448d4a4986534e90bf9fd69782782ae4e1e0508

I've actually gotten to the bottom of this while entering this issue. The problem is that in Arch the TZ environment variable points at the timezone file instead of being a string that names the timezone. By default it points to /etc/localtime which should be a symlink to /usr/share/zoneinfo/[timezone]. Would it be possible to support timezone data files instead of only timezone names?

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.