Calum Lind a481c4d243 [UI] Update UIs for new default piece priority
- libtorrent 1.1 changes default piece priorty to 4 so changes to
   the UIs are required. Some refactoring and improvements were made as well:

    - A new 'Low' priority introduced that is values 1-3.
    - 'Normal' priority is now value 4.
    - Removed 'Highest' with the addition of 'Low' and 'High' is now values 5-7.
    - Renamed 'Do not download' to 'Ignore' so it is more succinct.
    - Moved file priority constant to ui.common.
2017-01-18 12:33:27 +00:00
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