Reorganize runtime package

core/os/os.odin

@@ -1,6 +1,6 @@
 package os
 
-import "core:mem"
+import "core:raw"
 
 write_string :: proc(fd: Handle, str: string) -> (int, Errno) {
 	return write(fd, cast([]byte)str);
@@ -56,9 +56,11 @@ write_entire_file :: proc(name: string, data: []byte, truncate := true) -> (succ
 }
 
 write_ptr :: proc(fd: Handle, data: rawptr, len: int) -> (int, Errno) {
-	return write(fd, mem.slice_ptr(cast(^byte)data, len));
+	s := transmute([]byte)raw.Slice{data, len};
+	return write(fd, s);
 }
 
 read_ptr :: proc(fd: Handle, data: rawptr, len: int) -> (int, Errno) {
-	return read(fd, mem.slice_ptr(cast(^byte)data, len));
+	s := transmute([]byte)raw.Slice{data, len};
+	return read(fd, s);
 }

core/os/os_linux.odin

@@ -4,7 +4,6 @@ foreign import dl   "system:dl"
 foreign import libc "system:c"
 
 import "core:strings"
-import "core:mem"
 
 OS :: "linux";
 

core/os/os_osx.odin

@@ -4,7 +4,6 @@ foreign import dl   "system:dl"
 foreign import libc "system:c"
 
 import "core:strings"
-import "core:mem"
 
 OS :: "osx";
 

core/os/os_windows.odin

@@ -1,7 +1,6 @@
 package os
 
 import "core:sys/win32"
-import "core:mem"
 
 OS :: "windows";
 
@@ -269,7 +268,7 @@ _alloc_command_line_arguments :: proc() -> []string {
 	arg_list_ptr := win32.command_line_to_argv_w(win32.get_command_line_w(), &arg_count);
 	arg_list := make([]string, int(arg_count));
 	for _, i in arg_list {
-		wc_str := mem.ptr_offset(arg_list_ptr, i)^;
+		wc_str := (^win32.Wstring)(uintptr(arg_list_ptr) + size_of(win32.Wstring)*uintptr(i))^;
 		olen := win32.wide_char_to_multi_byte(win32.CP_UTF8, 0, wc_str, -1,
 		                                      nil, 0, nil, nil);