Convert BPMemory to BitField and enum class

Additional changes:
- For TevStageCombiner's ColorCombiner and AlphaCombiner, op/comparison and scale/compare_mode have been split as there are different meanings and enums if bias is set to compare.  (Shift has also been renamed to scale)
- In TexMode0, min_filter has been split into min_mip and min_filter.
- In TexImage1, image_type is now cache_manually_managed.
- The unused bit in GenMode is now exposed.
- LPSize's lineaspect is now named adjust_for_aspect_ratio.

Source/Core/VideoCommon/VertexLoaderManager.cpp

@@ -293,7 +293,7 @@ int RunVertices(int vtx_attr_group, int primitive, int count, DataReader src, bo
   // if cull mode is CULL_ALL, tell VertexManager to skip triangles and quads.
   // They still need to go through vertex loading, because we need to calculate a zfreeze refrence
   // slope.
-  bool cullall = (bpmem.genMode.cullmode == GenMode::CULL_ALL && primitive < 5);
+  bool cullall = (bpmem.genMode.cullmode == CullMode::All && primitive < 5);
 
   DataReader dst = g_vertex_manager->PrepareForAdditionalData(
       primitive, count, loader->m_native_vtx_decl.stride, cullall);