Use marks

[abstractlyZach]

Goodbye IDs! You were unnecessarily complicated! Now we use user-defined marks

• Use marks in toml
• Use marks instead of titles to identify windows
• upgrade pytest for verbose testing
• Refactor layout to use marks instead of IDs

[codecov-commenter]

Codecov Report

Merging #15 (f5fe414) into main (0dd39af) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main       #15   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            5         5           
  Lines           72        55   -17     
  Branches         8         2    -6     
=========================================
- Hits            72        55   -17     

Impacted Files	Coverage Δ
src/magic_tiler/layout.py	100.00% <100.00%> (ø)
src/magic_tiler/tiles.py	100.00% <100.00%> (ø)
src/magic_tiler/windows.py	100.00% <100.00%> (ø)

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