Bugfixes

Faster still. Veque now avoids using the allocator when a reallocation is needed, but current storage satisfies the new allocation needs.

Added missing stdlib header

Support for single-pass input iterators

Obscure bug fix when using unusual resize traits

Low-key performance and refactoring tweaks

Added missing constructor

Fixed missing inlining - gulp

Added new ResizeTraits traits template parameter. ResizeTraits controls how aggressively veque resizes and whether it follows std::vector iterator invalidation rules

Very useful r/cpp feedback