Implement achievement selection operations

[wgpierce]

Plumb full support for unlock all, relock all, and invert all achievements.

Bring stats/achievements naming into alignment.

Only set achievement lock unlock button as pressed when it's actually pressed/pending modification and reorient the logic around this.

Reorder signal handlers according to their order in the popup order Fix some documentation comments

Fixes #18

[wgpierce]

@afonsofrancof please have a look and help me test this. It works well in my testing.

[afonsofrancof]

I will test it tonight , thanks alot.

On Tue, Oct 29, 2019, 7:52 AM William Pierce notifications@github.com wrote:

@afonsofrancof https://github.com/afonsofrancof please have a look and help me test this. It works well in my testing.

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[PaulCombal]

I'll review this tonight, but it looks good so far!

[wgpierce]

@telans with the last commit, now the user gets feedback on if the current game has no achievements. I think we talked about that before.

Merging this now.