a lot of conceptual work

CMakeLists.txt

README.md

src/docs/Concepts.md

src/tg/backend/vulkan/vulkan-backend.cc

src/tg/builder/RenderPassBuilder.hh

src/tg/builder/builder.hh

src/tg/builder/pipelines/PrimitivePipelineBuilder.hh

src/tg/common/macros.hh

src/tg/common/trace.hh

src/tg/common/traits.hh

src/tg/data/cull_mode.hh

src/tg/data/polygon_mode.hh

src/tg/data/topology.hh

src/tg/data/type.hh

src/tg/data/vertex_format.hh

src/tg/objects/Buffer.hh

src/tg/objects/CommandBuffer.hh

src/tg/objects/Device.cc

src/tg/objects/Device.hh

src/tg/objects/Framebuffer.hh