Decodes HTML entities on title, description and title length count to prevent XSS

No proper decoding of title, description and title length could result to an XSS attack.

This vulnerability affects the following application versions:

• All in One SEO Pack 2.3.9
• All in One SEO Pack 2.3.9.1
• All in One SEO Pack 2.3.9.2
• All in One SEO Pack 2.3.10
• All in One SEO Pack 2.3.10.1
• All in One SEO Pack 2.3.10.2
• All in One SEO Pack 2.3.11
• All in One SEO Pack 2.3.11.1
• All in One SEO Pack 2.3.11.2
• All in One SEO Pack 2.3.11.3
• All in One SEO Pack 2.3.11.4
• All in One SEO Pack 2.3.12
• All in One SEO Pack 2.3.12.1
• All in One SEO Pack 2.3.12.2
• All in One SEO Pack 2.3.12.2.1
• All in One SEO Pack 2.3.12.3
• All in One SEO Pack 2.3.12.4
• All in One SEO Pack 2.3.12.5
• All in One SEO Pack 2.3.13
• All in One SEO Pack 2.3.13.1
• All in One SEO Pack 2.3.13.2
• All in One SEO Pack 2.3.14
• All in One SEO Pack 2.3.14.1
• All in One SEO Pack 2.3.14.2
• All in One SEO Pack 2.3.15
• All in One SEO Pack 2.3.15.1
• All in One SEO Pack 2.3.15.2
• All in One SEO Pack 2.3.15.3
• All in One SEO Pack 2.3.16