Feature/int api

[NailxSharipov]

Migrate to new template i16/i32/i64 solver

[codecov]

Codecov Report

❌ Patch coverage is 79.24051% with 82 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
iTriangle/src/float/unchecked.rs	0.00%	16 Missing ⚠️
iTriangle/src/float/custom.rs	0.00%	15 Missing ⚠️
iTriangle/src/float/triangulatable.rs	23.52%	13 Missing ⚠️
iTriangle/src/int/triangulation.rs	73.07%	7 Missing ⚠️
iTriangle/src/int/triangulator.rs	37.50%	5 Missing ⚠️
iTriangle/src/tessellation/circumcenter.rs	84.61%	4 Missing ⚠️
iTriangle/src/float/circumcenter.rs	40.00%	3 Missing ⚠️
iTriangle/src/int/custom.rs	0.00%	3 Missing ⚠️
iTriangle/src/int/triangulatable.rs	50.00%	3 Missing ⚠️
iTriangle/src/tessellation/split.rs	85.00%	3 Missing ⚠️
... and 7 more

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