Introduce meaningful color feedback for background tasks like file
downloads and uploads. Progress is displayed in a neutral color,
while successful completions turn green and failures turn red.
We reuse the existing THEME colors for now.
Add new UI flags ENTRY_COMPLETED and ENTRY_ERROR to
the buffer entry system. So we don't misuse delivery receipts anymore.
Fixes: https://github.com/profanity-im/profanity/issues/1758
Signed-off-by: Michael Vetter <jubalh@iodoru.org>
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.
