Iss56

[clhenrick]

Resolves the following issues:

• implements terrain-classic-featues.yml & terrain-classic-features.mss which:
  • moves buildings, lakes, & aeroways out of background layer
  • masks out DEM artifacts in water features & ocean along lake lines & coastlines
• buffers tiles so labels are not chopped off and tile seams are not visible on blurred land cover