updated (bdwgc/bdwgc@e849d64)

remove `obj_map.c

bump v0.3.0

BoehmAllocator (#8)

* BoehmAllocator - IAllocator compat
* examples: rename allocator
* example3 rewrited to betterC compat
* example4 rewrited

thread-safe allocator (#7)

bump v0.2.8

GCAllocator interface `@nogc` (#6)

based on `mallocator`
https://github.com/dlang/phobos/blob/master/std/experimental/allocator/mallocator.d

readme updated

updated to bdwgc v8.2.6

zon: pkgs updated

D import `@nogc` & `nothrow` module added for non-BetterC

fix bdwgc-package