EEVEE-Next: Add Film and RenderBuffers module

This modules handles renderpasses allocation and filling. Also handles
blitting to viewport framebuffer and render result reading.

Changes against the old implementation:
- the filling of the renderpasses happens all at once requiring
  only 1 geometry pass.
- The filtering is optimized with weights precomputed on CPU and
  reuse of neighboor pixels.
- Only one accumulation buffer for renderpasses (no ping-pong).
- Accumulation happens in one pass for every passes using a single
  dispatch or fullscreen triangle pass.

TAA and history reprojection is not yet implemented.
AOVs support is present but with a 16 AOV limit for now.
Cryptomatte is not yet implemented.

source/blender/draw/engines/eevee_next/eevee_shader.cc

@@ -78,6 +78,10 @@ ShaderModule::~ShaderModule()
 const char *ShaderModule::static_shader_create_info_name_get(eShaderType shader_type)
 {
   switch (shader_type) {
+    case FILM_FRAG:
+      return "eevee_film_frag";
+    case FILM_COMP:
+      return "eevee_film_comp";
     case VELOCITY_RESOLVE:
       return "eevee_velocity_resolve";
     /* To avoid compiler warning about missing case. */
@@ -161,7 +165,6 @@ void ShaderModule::material_create_info_ammend(GPUMaterial *gpumat, GPUCodegenOu
         }
       }
       info.vertex_inputs_.clear();
-      info.additional_info("draw_curves_infos");
       break;
     case MAT_GEOM_WORLD:
       /**