Dependencies: Remove GLFW, Add SDL2

citra: Remove GLFW, Add SDL2

FindSDL2: Do not CACHE SDL2_* variables if library is not found

EmuWindow_SDL2: Set minimal client area at initialisation time

EmuWindow_SDL2: Corrections

EmuWindow_SDL2: Fix no decorations on startup on OS X

cmake: windows_copy_files

externals/cmake-modules/WindowsCopyFiles.cmake

@@ -0,0 +1,28 @@
+# Copyright 2016 Citra Emulator Project
+# Licensed under GPLv2 or any later version
+# Refer to the license.txt file included.
+
+# This file provides the function windows_copy_files.
+# This is only valid on Windows.
+
+# Include guard
+if(__windows_copy_files)
+	return()
+endif()
+set(__windows_copy_files YES)
+
+# Any number of files to copy from SOURCE_DIR to DEST_DIR can be specified after DEST_DIR.
+# This copying happens post-build.
+function(windows_copy_files TARGET SOURCE_DIR DEST_DIR)
+    # windows commandline expects the / to be \ so switch them
+    string(REPLACE "/" "\\\\" SOURCE_DIR ${SOURCE_DIR})
+    string(REPLACE "/" "\\\\" DEST_DIR ${DEST_DIR})
+
+    # /NJH /NJS /NDL /NFL /NC /NS /NP - Silence any output
+    # cmake adds an extra check for command success which doesn't work too well with robocopy
+    # so trick it into thinking the command was successful with the || cmd /c "exit /b 0"
+    add_custom_command(TARGET ${TARGET} POST_BUILD
+        COMMAND if not exist ${DEST_DIR} mkdir ${DEST_DIR} 2> nul
+        COMMAND robocopy ${SOURCE_DIR} ${DEST_DIR} ${ARGN} /NJH /NJS /NDL /NFL /NC /NS /NP || cmd /c "exit /b 0"
+    )
+endfunction()