feat: extend single-step, and custom Tippecanoe configs.

[manmartgarc]

This PR closes #19 and closes #20.

Additions:

• Allow the single-step conversion mode to begin from a .fgb.
• Allow the user to point to a Tippecanoe configuration file that overrides the default one.

[github-actions[bot]]

Coverage Report

File	Stmts	Miss	Cover	Missing
/opt/hostedtoolcache/Python/3.9.15/x64/lib/python3.9/site-packages/cloudtile
__init__.py	0	0	100%
__main__.py	0	76	32%	29, 33, 39, 43, 45, 48–50, 57–61, 64–66, 69–74, 76–81, 83–85, 90, 92, 96–97, 103, 110–116, 135, 140–143, 147, 151, 155, 159–160, 164, 168, 172, 180–181, 185, 188–189, 194, 202, 207, 212, 239, 244–245, 249, 253, 264, 267, 274, 287–288, 292
converter.py	0	49	25%	33, 40, 44–46, 54–55, 58–59, 61, 63–66, 77–80, 82, 87, 90–91, 93–95, 97–98, 100–102, 122–124, 126, 128–130, 132–135, 137, 139–141, 143–145, 147
ecs.py	0	27	40%	48–49, 62, 72–74, 76, 78–81, 83, 85, 98, 102, 106–107, 109, 113, 120–121, 123–124, 128, 138–139, 141
geofile.py	0	93	40%	41–45, 55, 70–72, 88–94, 100–101, 114–120, 133–135, 138–139, 142–143, 151–154, 157, 178, 182–185, 195, 199–202, 214, 225–229, 239–240, 243–244, 246–249, 259–262, 272–274, 277, 287–289, 291–292, 294–298, 312–315, 317–318, 328, 331, 337–341, 351
s3.py	0	0	100%
TOTAL	478	245	48%

Tests	Skipped	Failures	Errors	Time
25	0 :zzz:	0 :x:	0 :fire:	4.563s :stopwatch: