PlaceholderAPI fixes for dialogs and HUDs, and a 3D armor shader option

Dialogs and HUDs

• Fixed PlaceholderAPI placeholders with arguments, such as %stat_{player_name}% and %server_time_HH:mm%, appearing as text or blank labels.

3D armor

• Set shaders: false on an armor set to render it with displays for all viewers, preventing pack loading failures on clients that cannot compile the armor shaders.
• Fixed false warnings for groups nested inside armor bones, such as a cape inside the body.
• Fixed items with armor3d: asking for an equipment texture they do not use.