Make core/ includes absolute, remove subfolders from include path

This allows more consistency in the manner we include core headers,
where previously there would be a mix of absolute, relative and
include path-dependent includes.

drivers/windows/dir_access_windows.cpp

@@ -32,9 +32,9 @@
 
 #include "dir_access_windows.h"
 
-#include "os/memory.h"
+#include "core/os/memory.h"
+#include "core/print_string.h"
 
-#include "print_string.h"
 #include <stdio.h>
 #include <wchar.h>
 #include <windows.h>

drivers/windows/dir_access_windows.h

@@ -33,7 +33,7 @@
 
 #ifdef WINDOWS_ENABLED
 
-#include "os/dir_access.h"
+#include "core/os/dir_access.h"
 
 /**
 	@author Juan Linietsky <reduz@gmail.com>

drivers/windows/file_access_windows.h

@@ -33,13 +33,15 @@
 
 #ifdef WINDOWS_ENABLED
 
-#include "os/file_access.h"
-#include "os/memory.h"
+#include "core/os/file_access.h"
+#include "core/os/memory.h"
+
 #include <stdio.h>
 
 /**
 	@author Juan Linietsky <reduzio@gmail.com>
 */
+
 class FileAccessWindows : public FileAccess {
 
 	FILE *f;

drivers/windows/mutex_windows.cpp

@@ -29,7 +29,8 @@
 /*************************************************************************/
 
 #include "mutex_windows.h"
-#include "os/memory.h"
+
+#include "core/os/memory.h"
 
 #ifdef WINDOWS_ENABLED
 

drivers/windows/mutex_windows.h

@@ -33,11 +33,14 @@
 
 #ifdef WINDOWS_ENABLED
 
-#include "os/mutex.h"
+#include "core/os/mutex.h"
+
 #include <windows.h>
+
 /**
 	@author Juan Linietsky <reduzio@gmail.com>
 */
+
 class MutexWindows : public Mutex {
 
 #ifdef WINDOWS_USE_MUTEX

drivers/windows/packet_peer_udp_winsock.cpp

@@ -35,6 +35,7 @@
 #include <winsock2.h>
 #include <ws2tcpip.h>
 
+// Must be included after Windows headers or hell breaks loose
 #include "drivers/unix/socket_helpers.h"
 
 int PacketPeerUDPWinsock::get_available_packet_count() const {

drivers/windows/packet_peer_udp_winsock.h

@@ -33,8 +33,8 @@
 #ifndef PACKET_PEER_UDP_WINSOCK_H
 #define PACKET_PEER_UDP_WINSOCK_H
 
-#include "io/packet_peer_udp.h"
-#include "ring_buffer.h"
+#include "core/io/packet_peer_udp.h"
+#include "core/ring_buffer.h"
 
 class PacketPeerUDPWinsock : public PacketPeerUDP {
 

drivers/windows/rw_lock_windows.cpp

@@ -32,8 +32,9 @@
 
 #include "rw_lock_windows.h"
 
-#include "error_macros.h"
-#include "os/memory.h"
+#include "core/error_macros.h"
+#include "core/os/memory.h"
+
 #include <stdio.h>
 
 void RWLockWindows::read_lock() {

drivers/windows/rw_lock_windows.h

@@ -33,7 +33,8 @@
 
 #if defined(WINDOWS_ENABLED)
 
-#include "os/rw_lock.h"
+#include "core/os/rw_lock.h"
+
 #include <windows.h>
 
 class RWLockWindows : public RWLock {

drivers/windows/semaphore_windows.cpp

@@ -32,7 +32,7 @@
 
 #if defined(WINDOWS_ENABLED)
 
-#include "os/memory.h"
+#include "core/os/memory.h"
 
 Error SemaphoreWindows::wait() {
 

drivers/windows/semaphore_windows.h

@@ -31,14 +31,16 @@
 #ifndef SEMAPHORE_WINDOWS_H
 #define SEMAPHORE_WINDOWS_H
 
-#include "os/semaphore.h"
+#include "core/os/semaphore.h"
 
 #ifdef WINDOWS_ENABLED
 
 #include <windows.h>
+
 /**
 	@author Juan Linietsky <reduzio@gmail.com>
 */
+
 class SemaphoreWindows : public Semaphore {
 
 	mutable HANDLE semaphore;

drivers/windows/shell_windows.h

@@ -31,12 +31,14 @@
 #ifndef SHELL_WINDOWS_H
 #define SHELL_WINDOWS_H
 
-#include "os/shell.h"
+#include "core/os/shell.h"
 
 #ifdef WINDOWS_ENABLED
+
 /**
 	@author Juan Linietsky <reduzio@gmail.com>
 */
+
 class ShellWindows : public Shell {
 public:
 	virtual void execute(String p_path);

drivers/windows/stream_peer_tcp_winsock.h

@@ -33,7 +33,7 @@
 #ifndef STREAM_PEER_TCP_WINSOCK_H
 #define STREAM_PEER_TCP_WINSOCK_H
 
-#include "error_list.h"
+#include "core/error_list.h"
 
 #include "core/io/ip_address.h"
 #include "core/io/stream_peer_tcp.h"

drivers/windows/thread_windows.cpp

@@ -32,7 +32,7 @@
 
 #if defined(WINDOWS_ENABLED) && !defined(UWP_ENABLED)
 
-#include "os/memory.h"
+#include "core/os/memory.h"
 
 Thread::ID ThreadWindows::get_id() const {
 

drivers/windows/thread_windows.h

@@ -31,16 +31,17 @@
 #ifndef THREAD_WINDOWS_H
 #define THREAD_WINDOWS_H
 
+#ifdef WINDOWS_ENABLED
+
+#include "core/os/thread.h"
+#include "core/script_language.h"
+
+#include <windows.h>
+
 /**
 	@author Juan Linietsky <reduzio@gmail.com>
 */
 
-#ifdef WINDOWS_ENABLED
-
-#include "os/thread.h"
-#include "script_language.h"
-#include <windows.h>
-
 class ThreadWindows : public Thread {
 
 	ThreadCreateCallback callback;