obj-loader & lambda-args

[vmarcella]

This PR includes:

• A new crate lambda-args for parsing arguments
• A new tool obj-loader to load OBJ files into lambda & render them in real time.
• Moved the module render and all of it's submodules from lambda::core::render into lambda::render to remove unneeded nesting.
• Removed the internal free functions in favor of separate impl blocks that scope private functions via pub(crate) & pub(super).
• Fixed a massive memory leak within the render loop which was allocating roughly 3 MB per second. The root cause being that command buffers were not being de-allocated after the command buffer had issued render commands.
• Packages importing lambda can now set the rendering API via feature flags (NOTE: These are still exclusive and shouldn't be used together at the moment. These can however be used to choose which rendering API gets used for communicating with the GPU).
  • lambda/with-opengl
  • lambda/with-vulkan
  • lambda/with-dx11
  • lambda/with-dx12
  • lambda/with-metal