all: fix all remaining unsafe 0 (#14856)

examples/term.ui/event_viewer.v

@@ -2,7 +2,7 @@ import term.ui as tui
 
 struct App {
 mut:
-	tui &tui.Context = 0
+	tui &tui.Context = unsafe { 0 }
 }
 
 fn event(e &tui.Event, x voidptr) {

examples/term.ui/pong.v

@@ -242,7 +242,7 @@ fn (mut b Ball) update(dt f32) {
 [heap]
 struct Game {
 mut:
-	app     &App = 0
+	app     &App = unsafe { 0 }
 	players []Player
 	ball    Ball
 }

examples/term.ui/rectangles.v

@@ -12,7 +12,7 @@ mut:
 
 struct App {
 mut:
-	tui      &tui.Context = 0
+	tui      &tui.Context = unsafe { 0 }
 	rects    []Rect
 	cur_rect Rect
 	is_drag  bool

examples/term.ui/term_drawing.v

@@ -90,7 +90,7 @@ const (
 
 struct App {
 mut:
-	ui                  &ui.Context = 0
+	ui                  &ui.Context = unsafe { 0 }
 	header_text         []string
 	mouse_pos           Point
 	msg                 string

examples/term.ui/text_editor.v

@@ -57,8 +57,8 @@ pub:
 
 struct App {
 mut:
-	tui           &tui.Context = 0
-	ed            &Buffer      = 0
+	tui           &tui.Context = unsafe { 0 }
+	ed            &Buffer      = unsafe { 0 }
 	current_file  int
 	files         []string
 	status        string

examples/term.ui/vyper.v

@@ -259,7 +259,7 @@ fn (mut r Rat) randomize() {
 [heap]
 struct App {
 mut:
-	termui &termui.Context = 0
+	termui &termui.Context = unsafe { 0 }
 	snake  Snake
 	rat    Rat
 	width  int

vlib/net/html/tag.v

@@ -16,7 +16,7 @@ pub mut:
 	children           []&Tag
 	attributes         map[string]string // attributes will be like map[name]value
 	last_attribute     string
-	parent             &Tag = 0
+	parent             &Tag = unsafe { 0 }
 	position_in_parent int
 	closed             bool
 	close_type         CloseTagType = .in_name

vlib/picohttpparser/response.v

@@ -6,7 +6,7 @@ pub:
 	date      &u8 = unsafe { 0 }
 	buf_start &u8 = unsafe { 0 }
 pub mut:
-	buf &u8 = 0
+	buf &u8 = unsafe { 0 }
 }
 
 [inline]

vlib/x/ttf/render_bmp.v

@@ -19,7 +19,7 @@ import math
 pub struct BitMap {
 pub mut:
 	tf       &TTF_File
-	buf      &u8 = 0 // pointer to the memory buffer
+	buf      &u8 = unsafe { 0 } // pointer to the memory buffer
 	buf_size int // allocated buf size in bytes
 	width    int = 1 // width of the buffer
 	height   int = 1 // height of the buffer