Add settings to enable debug drawing for tiles and labels #201
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This is mostly to aid in style evaluation and debugging. With tile debug info enabled, the boundaries and coordinates (x, y, zoom) of each tile is made visible. With label debug info enabled, anchor points and bounding boxes for each label are made visible.
I considered making this a single toggle but the label debug drawing is quite slow and usually not needed. Remaining nitpicks:
Settings aren't applied until the settings menu is opened (i.e. until a(Thanks Chuck!)SettingsFragment
is created); not sure how to fix this most simply.Closes #167