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f27d304f3b
Opening the same account (context) from multiple processes is dangerous, can result in duplicate downloads of the same message etc. Same for account manager, attempts to modify the same accounts.toml even if done atomically with may result in corrupted files as atomic replacement procedure does not expect that multiple processes may write to the same temporary file. accounts.toml cannot be used as a lockfile because it is replaced during atomic update. Therefore, a new file next to accounts.toml is needed to prevent starting second account manager in the same directory. But iOS needs to be able to open accounts from multiple processes at the same time. This is required as the "share-to-DC extension" is a separate process by iOS design -- this process may or may not be started while the main app is running. Accounts are not altered however by this extension, so let's add to the `Accounts::new()` constructor an `rdwr` parameter which allows to read the accounts config w/o locking the lockfile.