Fix bugs

• Allow set extraImageClass (custom image class, can be multiples class)
• Hide debugger setting (Protect content)
• Fix ShowCast() CSS (overflow issue)
• JS strip tags (Protect from user side injection)
• Fix text format detect (bold, italic, underline)
• Disable @# (regex incorrect tagging issue)
• Simplify renderRoleSide() (simplify render script)