Style: Harmonize header includes in platform ports

This applies our existing style guide, and adds a new rule to that style
guide for modular components such as platform ports and modules:

Includes from the platform port or module should be included with relative
paths (relative to the root folder of the modular component, e.g.
`platform/linuxbsd/`), in their own section before Godot's "core" includes.

The `api` and `export` subfolders also need to be handled as self-contained
(and thus use relative paths for their "local" includes) as they are all
compiled for each editor platform, without necessarily having the api/export
matching platform folder in the include path.
E.g. the Linux editor build will compile `platform/android/{api,export}/*.cpp`
and those need to use relative includes for it to work.

platform/windows/windows_terminal_logger.cpp

@@ -33,6 +33,7 @@
 #ifdef WINDOWS_ENABLED
 
 #include <stdio.h>
+
 #define WIN32_LEAN_AND_MEAN
 #include <windows.h>
 
@@ -163,4 +164,4 @@ void WindowsTerminalLogger::log_error(const char *p_function, const char *p_file
 
 WindowsTerminalLogger::~WindowsTerminalLogger() {}
 
-#endif
+#endif // WINDOWS_ENABLED