Calculate sizes of tiles

[oubiwann]

Steps:

1. [x] Get row
2. [x] Check if the row is the first or last one and special-case those two
3. [x] Count pixels in row
4. [x] Calculate lon degrees per pixel
5. [x] Calculate lat degrees per pixel
6. [x] Calculate geodesic surfaces for each pixel
   1. [x] At poles, use triangles
   2. [x] Everywhere else, use rectangles
7. [x] Calculate centers for each geodesic
   1. [x] For geodesic triangles, approximate with half base and 2/3 from top
   2. [x] For geodesic rectangles, halve each to find the distance to the center point of tile from any size of the tile
   3. [x] Multiply by pixel index and lat/lon degrees to get 4 corner coordinates and the center tile coordinate

[oubiwann]

Gonna need a function that calculates the equator based on starting and ending rows. This can then be used to normalize lat sign (-/+; if 0, then equator).

[oubiwann]

Done.