Widget Threads Enhancement 2.1.4

Notable changes:

• Improvement generate cache ID.

Notable changes:

• Fixed invalid total threads
• Added new option: Article default image to show thread without image cover.

Notable changes:

• Added new article image dimensions options.
• Improvement handle auto refresh

Notable changes:

• Fixed invalid insert items when press load more.

Notable changes:

• Fixed cache issues
• Improvement render widget page

Notable changes:

• Support auto refresh widget content
• Support widget paging. The next content will be load through AJAX.
• Bump PHP requirement to 7.2.0 or higher

Notable changes:

• Fixed invalid article thread link

Notable changes:

• Added support display style Article
• Fixed display widget title in some cases.

Notable changes:

• Supported new type: Random threads
• Supported snippet preview message in expanded style.

Notable changes:

• Fixed save widget cache error.