Fixes https://github.com/profanity-im/profanity/issues/1794
Explanation
The problem is the download's identifier. Downloads are given an ID so they can be referenced later when their progress changes. Currently, the download's ID is the download's URL. When you download the same file twice, you have two downloads with the same ID. Download progress updates are shown on the first of both downloads with the same ID.
Solution
Change the download's ID from its URL to a random number. A random ID is generated when get_random_string() is called from cmd_funcs.c. Several other functions are updated to cope with the new ID format.
In case the user decides to ignore the validity-state of certificates
we also have to configure libcurl accordingly.
`tls.policy` can be set via
```
/account set <account> tls trust
```
Signed-off-by: Steffen Jaeckel <jaeckel-floss@eyet-services.de>
The profanity-internal mechanism to allow connecting to a server isn't
easily portable to cURL. Therefor introduce a profanity-specific CAfile
which is managed individually and will be configured in libcurl calls.
Signed-off-by: Steffen Jaeckel <jaeckel-floss@eyet-services.de>
