Clean up #includes

Remove unused headers, and avoid relying on transitive inclusions

`include-what-you-use` has been very useful for this!

src/gfx/main.cpp

@@ -5,11 +5,9 @@
 #include <algorithm>
 #include <assert.h>
 #include <ctype.h>
-#include <fstream>
 #include <inttypes.h>
 #include <ios>
 #include <limits>
-#include <numeric>
 #include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>

src/gfx/pal_packing.cpp

@@ -4,10 +4,8 @@
 
 #include <algorithm>
 #include <assert.h>
-#include <bitset>
 #include <deque>
 #include <inttypes.h>
-#include <numeric>
 #include <optional>
 #include <queue>
 #include <type_traits>
@@ -15,6 +13,7 @@
 
 #include "helpers.hpp"
 
+#include "gfx/main.hpp"
 #include "gfx/proto_palette.hpp"
 
 using std::swap;

src/gfx/pal_sorting.cpp

@@ -3,11 +3,11 @@
 #include "gfx/pal_sorting.hpp"
 
 #include <algorithm>
+#include <assert.h>
 
 #include "helpers.hpp"
 
 #include "gfx/main.hpp"
-#include "gfx/process.hpp"
 
 namespace sorting {
 

src/gfx/pal_spec.cpp

@@ -9,7 +9,6 @@
 #include <inttypes.h>
 #include <limits.h>
 #include <optional>
-#include <ostream>
 #include <stdint.h>
 #include <stdio.h>
 #include <streambuf>
@@ -17,9 +16,8 @@
 #include <string>
 #include <string_view>
 #include <tuple>
-#include <type_traits>
-#include <unordered_map>
 
+#include "helpers.hpp"
 #include "platform.hpp"
 
 #include "gfx/main.hpp"

src/gfx/process.cpp

@@ -5,13 +5,9 @@
 #include <algorithm>
 #include <assert.h>
 #include <errno.h>
-#include <fstream>
 #include <inttypes.h>
-#include <limits.h>
-#include <memory>
 #include <optional>
 #include <png.h>
-#include <setjmp.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <string.h>

src/gfx/proto_palette.cpp

@@ -2,6 +2,7 @@
 
 #include "gfx/proto_palette.hpp"
 
+#include <algorithm>
 #include <assert.h>
 
 #include "helpers.hpp"

src/gfx/reverse.cpp

@@ -6,17 +6,14 @@
 #include <array>
 #include <assert.h>
 #include <errno.h>
-#include <fstream>
 #include <inttypes.h>
 #include <optional>
 #include <png.h>
 #include <string.h>
-#include <tuple>
 #include <vector>
 
 #include "defaultinitalloc.hpp"
 #include "file.hpp"
-#include "helpers.hpp"
 #include "itertools.hpp"
 
 #include "gfx/main.hpp"