Fix RouteData issue and refactor core classes

[tomgilder]

No description provided.

[codecov]

Codecov Report

Merging #214 (6fad2ce) into main (456b966) will increase coverage by 0.21%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #214      +/-   ##
==========================================
+ Coverage   99.27%   99.49%   +0.21%     
==========================================
  Files          18       18              
  Lines         965      984      +19     
==========================================
+ Hits          958      979      +21     
+ Misses          7        5       -2     

Impacted Files	Coverage Δ
lib/routemaster.dart	99.50% <100.00%> (+<0.01%)	⬆️
lib/src/pages/page_stack.dart	100.00% <100.00%> (ø)
lib/src/pages/pages.dart	100.00% <100.00%> (ø)
lib/src/pages/stack_page.dart	100.00% <100.00%> (ø)
lib/src/pages/tab_pages.dart	100.00% <100.00%> (ø)
lib/src/route_data.dart	100.00% <100.00%> (ø)
lib/src/pages/transition_page.dart	100.00% <0.00%> (+3.27%)	⬆️

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