Reduce the header declarations (#1342)

- Since we have style rules to include foo.hpp at the top of its
  corresponding foo.cpp, this takes any headers included by foo.hpp
  as being also guaranteed for foo.cpp.

- Use C-style <foo.h> instead of <cfoo>, since the latter only
  guarantees putting symbols in the `std` namespace, which we are
  not using for C functions (e.g. `printf` not `std::printf`).

- Remove now-unused `__PRETTY_FUNCTION__` reporting

src/gfx/pal_packing.cpp

@@ -5,20 +5,16 @@
 #include <algorithm>
 #include <assert.h>
 #include <bitset>
-#include <cinttypes>
 #include <deque>
+#include <inttypes.h>
 #include <numeric>
 #include <optional>
 #include <queue>
-#include <tuple>
 #include <type_traits>
 #include <unordered_set>
-#include <vector>
 
-#include "defaultinitalloc.hpp"
 #include "helpers.hpp"
 
-#include "gfx/main.hpp"
 #include "gfx/proto_palette.hpp"
 
 using std::swap;