Remove SDL_main from VS Solutions in VisualC/ and VisualC-GDK/

and update README-visualc.md and README-gdk.md accordingly

Also moved src/main/windows/version.rc to src/core/windows/
and adjusted VS solutions, CMakeLists.txt and versioning scripts
in build-scripts/ accordingly.

This will eventually allow us to remove all of src/main/

# Conflicts:
#	VisualC/tests/testgesture/testgesture.vcxproj

src/core/windows/version.rc

@@ -1,38 +1,38 @@
-
-#include "winresrc.h"
-
-LANGUAGE LANG_ENGLISH, SUBLANG_ENGLISH_US
-
-/////////////////////////////////////////////////////////////////////////////
-//
-// Version
-//
-
-VS_VERSION_INFO VERSIONINFO
- FILEVERSION 3,0,0,0
- PRODUCTVERSION 3,0,0,0
- FILEFLAGSMASK 0x3fL
- FILEFLAGS 0x0L
- FILEOS 0x40004L
- FILETYPE 0x2L
- FILESUBTYPE 0x0L
-BEGIN
-    BLOCK "StringFileInfo"
-    BEGIN
-        BLOCK "040904b0"
-        BEGIN
-            VALUE "CompanyName", "\0"
-            VALUE "FileDescription", "SDL\0"
-            VALUE "FileVersion", "3, 0, 0, 0\0"
-            VALUE "InternalName", "SDL\0"
-            VALUE "LegalCopyright", "Copyright (C) 2022 Sam Lantinga\0"
-            VALUE "OriginalFilename", "SDL3.dll\0"
-            VALUE "ProductName", "Simple DirectMedia Layer\0"
-            VALUE "ProductVersion", "3, 0, 0, 0\0"
-        END
-    END
-    BLOCK "VarFileInfo"
-    BEGIN
-        VALUE "Translation", 0x409, 1200
-    END
-END
+
+#include "winresrc.h"
+
+LANGUAGE LANG_ENGLISH, SUBLANG_ENGLISH_US
+
+/////////////////////////////////////////////////////////////////////////////
+//
+// Version
+//
+
+VS_VERSION_INFO VERSIONINFO
+ FILEVERSION 3,0,0,0
+ PRODUCTVERSION 3,0,0,0
+ FILEFLAGSMASK 0x3fL
+ FILEFLAGS 0x0L
+ FILEOS 0x40004L
+ FILETYPE 0x2L
+ FILESUBTYPE 0x0L
+BEGIN
+    BLOCK "StringFileInfo"
+    BEGIN
+        BLOCK "040904b0"
+        BEGIN
+            VALUE "CompanyName", "\0"
+            VALUE "FileDescription", "SDL\0"
+            VALUE "FileVersion", "3, 0, 0, 0\0"
+            VALUE "InternalName", "SDL\0"
+            VALUE "LegalCopyright", "Copyright (C) 2022 Sam Lantinga\0"
+            VALUE "OriginalFilename", "SDL3.dll\0"
+            VALUE "ProductName", "Simple DirectMedia Layer\0"
+            VALUE "ProductVersion", "3, 0, 0, 0\0"
+        END
+    END
+    BLOCK "VarFileInfo"
+    BEGIN
+        VALUE "Translation", 0x409, 1200
+    END
+END