feat: categories/labels

[micielski]

TODO:

• Config file
• Figure out whether category's prefix should be inserted into torrent's name or be a seperate header
• Ask about a category when adding a new magnet
• Don't ask about a category when there are no categories
• Ask about a category when adding a new magnet from search tab (this will take many lines of code probably)
• New task - change category with default binding to c (but don't allow adding a completely new category this way)
• Auto completion when being asked about a category in a task
• Remove "Bar" from tasks' name
• Calculate icon and category length better

[micielski]

There's a new config: categories.toml

# Example category:
# [[category]]
# name = "Classical Music"             # required
# icon = "[M]"                         # optional, default: ""
# default_dir = "/mnt/Music/Classical" # optional, default: transmission's default
# color = "Green"                      # optional, default: "White"

and a new option in config.toml under [torrents_tab]:

[search_tab]
# Whether to insert category icon into name as declared in categories.toml.
# An alternative to inserting category's icon into torrent's name is adding a
# CategoryIcon header into your headers.
category_icon_insert_into_name = true

The user is now being asked about a category when adding a magnet:

(you can press TAB or CTRL-f or right arrow to autocomplete).

After that, the default directory for given category is set:

In the torrents tab a torrent with a category may look something like this:

There are also two new headers: CategoryIcon and Category, so you can customize how do you want to display info about a category

@aidanaden Could you give it a try?