os: Make windows allocations more consistent & LocalFree args_list

if max is 512 then allocate `max * sizeof(wchar_t)`

vlib/os/os.v

@@ -100,6 +100,8 @@ fn init_os_args(argc int, argv *byteptr) []string {
 		for i := 0; i < args_count; i++ {
 			args << string_from_wide(&u16(args_list[i]))
 		}
+
+		C.LocalFree(args_list)
 	} $else {
 		for i := 0; i < argc; i++ {
 			args << string(argv[i])
@@ -520,7 +522,7 @@ pub fn get_line() string {
 pub fn get_raw_line() string {
 	$if windows {
 		max := 512 // MAX_PATH * sizeof(wchar_t)
-		buf := &u16(malloc(max))
+		buf := &u16(malloc(max*2))
 		h_input := C.GetStdHandle(STD_INPUT_HANDLE)
 		if h_input == INVALID_HANDLE_VALUE {
 			panic('get_raw_line() error getting input handle.')
@@ -658,8 +660,9 @@ pub fn executable() string {
 		return string(result, count)
 	}
 	$if windows {
-		mut result := &u16(malloc(512)) // MAX_PATH * sizeof(wchar_t)
+		max := 512
-		len := int(C.GetModuleFileName( 0, result, MAX_PATH ))
+		mut result := &u16(malloc(max*2)) // MAX_PATH * sizeof(wchar_t)
+		len := int(C.GetModuleFileName( 0, result, max ))
 		return string_from_wide2(result, len)
 	}
 	$if mac {
@@ -731,9 +734,9 @@ pub fn chdir(path string) {
 
 pub fn getwd() string {	
 	$if windows {
-		max := 1024 // MAX_PATH * sizeof(wchar_t)
+		max := 512 // MAX_PATH * sizeof(wchar_t)
-		buf := &u16(malloc(max))
+		buf := &u16(malloc(max*2))
-		if C._wgetcwd(buf, max/2) == 0 {
+		if C._wgetcwd(buf, max) == 0 {
 			return ''
 		}
 		return string_from_wide(buf)