[renderer] Small refactorings

[IAmNotHanni]

Closes #238.

[IAmNotHanni]

This code change also fixes an issues with queue management. The problem is that sometimes we passed the graphics queue to a constructor which names it internally as data_transfer_queue. Because both are just VkQueue, the constructor accepts it and passes it on even further down to the members.

For example this:

m_textures.emplace_back(*m_vkdevice, m_vkdevice->physical_device(),
                                       m_vkdevice->allocator(), texture_file,
                                       texture_name, m_vkdevice->graphics_queue(),
                                       m_vkdevice->graphics_queue_family_index());

will be passed on to:

Texture::Texture(const wrapper::Device &device, const VkPhysicalDevice graphics_card,
                 const VmaAllocator vma_allocator, const std::string &file_name,
                 const std::string &name, const VkQueue data_transfer_queue,
                 const std::uint32_t data_transfer_queue_family_index)

This new code has been changed so it is the constructor call to CommandBuffer which specifies the queue which is used.

[yeetari]

Nice work :)

[IAmNotHanni]

I will include other small refactorings into this pull request as well.

[IAmNotHanni]

I'm not done yet here but I wanted to push just already. Will finish and squash later.

[IAmNotHanni]

I changed my mind: I overloaded this pull request!
I will git cherry-pick the first 2 commits which contain the changes and your requested fixed, squash them and create a separate pull request.
Then I will do the other issues one by one.