google / vector_math.dart / 172

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Reuse temp variables in Aabb2.transform methods. (#211)

* Reuse temp variables in Aabb2.transform methods.
Improve consistency in avoiding public getters in a number of methods.
Add benchmarks for affected code to ensure positive performance impact.

Aabb2.transform is about 11% faster with these changes.
Aabb2.rotate is about 17% faster with these changes.

The rest of the changes had no measurable benchmark impact, but improve
consistency in the source base.

(Added .idea directory from IntelliJ/Android Studio to .gitignore)

* Update 64-bit sources to match.

* Ran dartfmt on files.

* Apply same optimization to Aabb3 methods.

Aabb3.transform is about 11% faster with the change.
Aabb3.rotate is about 14% faster with the change.

57 of 57 new or added lines in 3 files covered. (100.0%)

4253 of 8556 relevant lines covered (49.71%)

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