Allow constructing a point from any object with x/y/z members.

[josephbirkner]

Interfacing with simfil points is a bit cumbersome, as there are no useful constructors defined. This PR bumps simfils C++ requirement to 20, and uses concepts to define a constructor which can take any object with x/y(/z) members, such as a glm vector.

[github-actions[bot]]

Test Results

  1 files  ±0    1 suites  ±0   10s :stopwatch: ±0s 40 tests ±0  40 :heavy_check_mark: ±0  0 :zzz: ±0  0 :x: ±0  41 runs  ±0  41 :heavy_check_mark: ±0  0 :zzz: ±0  0 :x: ±0 

Results for commit f1eea784. ± Comparison against base commit 7969b196.

:recycle: This comment has been updated with latest results.

[github-actions[bot]]

Package	Line Rate	Branch Rate	Health
include.simfil	54%	37%	➖
include.simfil.model	73%	63%	➖
src	63%	35%	➖
src.model	78%	44%	➖
Summary	65% (2313 / 3541)	37% (1940 / 5212)	➖

Minimum allowed line rate is 50%