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Author SHA1 Message Date
Hennadii Chernyshchyk
458cb7a9e9 Add headless mode (#3439)
# Objective

In this PR I added the ability to opt-out graphical backends. Closes #3155.

## Solution

I turned backends into `Option` ~~and removed panicking sub app API to force users handle the error (was suggested by `@cart`)~~.
2022-01-08 10:39:43 +00:00