buffer_cache/buffer_base: Add a range tracking buffer container

It keeps track of the modified CPU and GPU ranges on a CPU page
granularity, notifying the given rasterizer about state changes
in the tracking behavior of the buffer.

Use a small vector optimization to store buffers smaller than 256 KiB
locally instead of using free store memory allocations.

src/video_core/CMakeLists.txt

@@ -1,6 +1,7 @@
 add_subdirectory(host_shaders)
 
 add_library(video_core STATIC
+    buffer_cache/buffer_base.h
     buffer_cache/buffer_block.h
     buffer_cache/buffer_cache.h
     buffer_cache/map_interval.cpp