0.5.5 features

[lerno]

Changes / improvements

• Disallow multiple _ in a row in digits, e.g. 1__000.

Fixes

• Struct/union members now correctly rejects members without storage size Struct member of type void crashes compiler #1147.
• math::pow will now correctly promote integer arguments.
• Pointer difference would fail where alignment != size (structs etc) Incorrect pointer math for struct pointers #1150
• Fixed array calculation for npot2 vectors.

Stdlib changes

• Added new_aligned and alloc_aligned functions to prevent accidental under-alignment when allocating simd.
• Fixes to realloc of aligned allocations