Make arbitrator better able to parse sport levels

[jwir3]

Right now, arbitrator relies on an exact hash map of sport levels in order to parse them and place them in the Game data structure. It would be nice if an heuristic was used instead, so that for example, whether it is a Boys' or Girls' game, level of the sport (e.g. "Squirt", "Mite", etc...), and the sub-level of the sport (e.g. "Varsity", "A", "AA", etc...) were all determined independently.

[jwir3]

Also, we should add a U15 level, since it looks like the U15 level is not currently being tracked in the scheduled events (the game level appears to just be blank).

[jwir3]

So, what I'm considering doing for this feature is to have an overarching LevelProfiles object, which is stored in the configuration. This is a set of GameLevel objects. Each GameLevel object is a set of GameAgeLevel objects. The hierarchy looks like:

- LevelProfiles
   - GameAge(age)
    - GameAgeLevel(regex, age, level)

So, we might have something like:

- Level Profiles
  - GameAge('Bantam')
    - GameAgeLevel('...', 'Bantam', 'A')
    - GameAgeLevel('...', 'Bantam', 'B1')
    - GameAgeLevel('...', 'Bantam', 'B2')
    - GameAgeLevel('...', 'Bantam', 'C')

So, now the trick here is that we need to somehow generate the regular expressions for each GameAgeLevel. I suspect what we could do is use the following general algorithm:

Search for the first letter of the name of game age and the full word of the game level, followed by some number of characters, and then the level. If more than one `GameAgeLevel` matches, then separate them by 'OR' in the output string. 

[jwir3]

Each one is going to probably be slightly different, since, for example, U15 and 15U are, essentially, the same thing. :(

[jwir3]

This is almost completely done. We have a series of minor bug fixes and tweaks once this lands, though.

Things left to do here:

• [x] Fix issue with transitioning back in GameAgeLevel UI.
• [x] Fix issue where a null GameAgeProfile is added to preferences.
• [x] Verify that adding a new GameAgeLevel also refreshes preferences.
• [x] Re-arrange elements in GameAgeLevel listing so name of level is first.
• [x] Add column headers to top of GameAgeLevel listing.
• [x] Sort GameAgeLevels in alphabetical order.
• [x] Verify deletion of GameAgeLevels works as expected.
• [x] Verify modification of GameAgeLevels works as expected.
• [x] Refactor UIManager code to not have to call PreferenceStore._putPreferences() directly.
• [x] Weird situation when adding a level that is alphabetically in between other levels.
• [x] Rename GameAgeLevel and GameAgeProfile to better, more intuitive names.
• [x] Sort the league profiles in alphabetical order.
• [x] Verify everything is documented as necessary.
• [x] Add task ticket for unification of profiles.
• [x] Add enhancement ticket for importing/exporting individual game level profiles.
• [x] Add task ticket for creating game level profile(s) for current leagues (along with tests).