Aos 2 fixes efif

[efifogel]

Summary of Changes

This addresses issue #9084. In particular, I replaced Cartesian with Simple_cartesian in all traits.
I also defined Multiplicity to be std::size_t in all traits. In addition, I replaced typedef with using and properly indented and cleaned up the code in the source files I touched. I simplified the code that approximates a point of the traits classes Arr_linear_traits_2, Arr_segment_traits_2, and Arr_non_caching_segment_basic_traits_2.h. I did not use the GAL::Cartesian_coverter (mentioned in issue #9084) because the code is now simple as it is(just one line in each traits class).

I also added a missing inline in draw_arrangement_2. This is unrelated to the above.

Release Management

• Affected package(s): Arrangement_on_surface_2
• Issue(s) solved (if any): fix Additional changes for Arrangement traits #9084
• Feature/Small Feature (if any):
• Link to compiled documentation (obligatory for small feature) wrong link name to be changed
• License and copyright ownership: TAU