Use pointing hand cursor shape for clickable buttons in the About dialog

This makes it clearer that the buttons can be clicked.

Tooltips were also modified to match the respective platforms'
branding guidelines.

addons/material_maker/widgets/about/about.tscn

@@ -58,6 +58,7 @@ size_flags_vertical = 6
 margin_right = 32.0
 margin_bottom = 32.0
 rect_min_size = Vector2( 32, 32 )
+mouse_default_cursor_shape = 2
 texture_normal = ExtResource( 3 )
 expand = true
 stretch_mode = 4
@@ -100,6 +101,7 @@ margin_right = 24.0
 margin_bottom = 24.0
 rect_min_size = Vector2( 24, 24 )
 hint_tooltip = "Facebook"
+mouse_default_cursor_shape = 2
 texture_normal = ExtResource( 5 )
 expand = true
 stretch_mode = 4
@@ -110,6 +112,7 @@ margin_right = 52.0
 margin_bottom = 24.0
 rect_min_size = Vector2( 24, 24 )
 hint_tooltip = "Twitter"
+mouse_default_cursor_shape = 2
 texture_normal = ExtResource( 6 )
 expand = true
 stretch_mode = 4
@@ -119,7 +122,8 @@ margin_left = 56.0
 margin_right = 80.0
 margin_bottom = 24.0
 rect_min_size = Vector2( 24, 24 )
-hint_tooltip = "Youtube"
+hint_tooltip = "YouTube"
+mouse_default_cursor_shape = 2
 texture_normal = ExtResource( 7 )
 expand = true
 stretch_mode = 4
@@ -129,7 +133,8 @@ margin_left = 84.0
 margin_right = 108.0
 margin_bottom = 24.0
 rect_min_size = Vector2( 24, 24 )
-hint_tooltip = "Github"
+hint_tooltip = "GitHub"
+mouse_default_cursor_shape = 2
 texture_normal = ExtResource( 8 )
 expand = true
 stretch_mode = 4
@@ -139,7 +144,8 @@ margin_left = 112.0
 margin_right = 136.0
 margin_bottom = 24.0
 rect_min_size = Vector2( 24, 24 )
-hint_tooltip = "ItchIO"
+hint_tooltip = "itch.io"
+mouse_default_cursor_shape = 2
 texture_normal = ExtResource( 9 )
 expand = true
 stretch_mode = 4