Fix aligned memory allocation

[Smertig]

Closes #1192

• Reworked sol::detail::aligned_space_for<Ts...>
  • If no type is over-aligned (alignof(Ts) <= alignof(std::max_align_t) for all Ts...), calculate maximum possible required size assuming that allocator can return absolutely any address
  • Otherwise assume that every single type in pack has initial address 0x1 (the worst alignment)
  • Make it constexpr
• Always do only one allocation with required memory size. "aligned allocation failed" error should never happen anymore
• Remove unused arguments/variables (it was probably a legacy code)

[ThePhD]

This actually does look good to me, albeit the tests will always fail for one or two platforms because we're running into a hard regression thanks to lua_error thrashing the stack in some cases of optimized code. Can't escape it, so the CI will always go red.

I'm gonna run this locally and try to fix things up, so forgive me if merging this takes a little bit!!!

[ThePhD]

Lllllooooooooooooooooooooooks good to me and makes things much faster / more consistent when alignment gets weird. Thanks so much for this!

I was originally going to promote these functions out of the detail namespace since they're used but I'll do that later, since that's technically a breaking change.

[ThePhD]

Ssssskskskskdskdjakdasjk I closed it and almost panicked because the merge button disappeared

I AM A PROFESSIONAL I PROMISE!!