Add R8 pipeline type

[dati91]

vkCreateFramebuffer(): VkFramebufferCreateInfo attachment #0 has format of VK_FORMAT_R8_UNORM that does not match the format of VK_FORMAT_B8G8R8A8_UNORM used by the corresponding attachment for renderPass (0x6). The spec valid usage text states 'Each element of pAttachments must have been created with an VkFormat value that matches the VkFormat specified by the corresponding VkAttachmentDescription in renderPass' (https://www.khronos.org/registry/vulkan/specs/1.0/html/vkspec.html#VUID-VkFramebufferCreateInfo-pAttachments-00880)

We should create a render pass with R8 format attachment and create pipeline for that case.

[dati91]

Actually first we have to just check how will be this R8 texture used, maybe we just don't have to create a framebuffer for it. For now we create frame buffer for every texture.

[dati91]

The R8 comes from the debug_render. Which we don't use at the moment.