Improve compile time/custom containers [ongoing effort]

[Kenneth Gorking]

https://www.zverovich.net/2017/12/09/improving-compile-times.html

https://devblogs.microsoft.com/cppblog/build-throughput-series-template-metaprogramming-fundamentals/

https://floooh.github.io/2018/05/01/cpp-to-c-size-reduction.html

https://doc.magnum.graphics/corrade/classCorrade_1_1Containers_1_1Array.html

[Kenneth Gorking]

PR #183 got rid of tuples in component pools. Should help.

[Kenneth Gorking]

PR #184 improved compile times, shaved 2 minutes of gcc in CI compiles

[Kenneth Gorking]

PR #189 removes the need for tuples to store component pools

[Kenneth Gorking]

PR #192 removed tuples from 2 of 3 systems. system_hierarchy will be updated after an algorithm rewrite.

[Kenneth Gorking]

#196 removed tuples from system_hierarchy

[Kenneth Gorking]

#217 added module support.