Initialize structure VmaAllocator_T::m_VulkanFunctions to zeros in constructor to avoid garbage pointers
Initialize structure VmaAllocator_T::m_VulkanFunctions to zeros in constructor to avoid garbage pointers

Fixes #73

GPUOpen-LibrariesAndSDKs/VulkanMemoryAllocator,GPUOpen-LibrariesAndSDKs/VulkanMemoryAllocator,GPUOpen-LibrariesAndSDKs/VulkanMemoryAllocator