Admin and Site Enhancements Pro v8.3.0

* **[ADDED in Free and Pro] Content Management >> Media Files Visibility Control**: in ASE Free, this module will limit media library in a way that only administrators can see all media files. Non-administrator users will only see media files they uploaded themselves in the media library and in the modal window to add/insert media. ASE Pro adds an option to specify which non-administrator user roles will be limited to only seeing media files they uploaded themselves. 

* **[IMPROVED in Pro] Content Management >> Custom Content Types >> Custom Field Groups**:
  * In the Placement tab, post types now shows the label as well. e.g. 'post' now becomes 'Posts (post)'.
  * In the Placement tab, user roles now shows the label as well. e.g. 'administrator' now becomes 'Administrator (administrator)'.
  * Fixed PHP warnings related to custom field group creation / update process.

* **[IMPROVED in Pro] Utilities >> File Manager**:
  * Add the option to set FM_READ_ONLY constant to true in wp-config.php if you want to activate read-only mode, i.e. only Open and Download actions are available.
  * Add a note in the module to quickly explain about enabling the read-only mode by setting FM_READ_ONLY, DISALLOW_FILE_MODS or DISALLOW_FILE_EDIT to true in wp-config.php.

* **[IMPROVED in Pro] Custom Code >> Code Snippets Manager**: 
  * add an "Export / Import Snippets" button in the snippets listing page and an "Export / Import Snippets" submenu item inside the "Code Snippets" admim menu. Both link to the snippets export / import section in the main ASE settings page, at the bottom. Props to Henry R. for prompting this improvement.
  * for CSS snippets, there's a new option to load the snippet within the block editor. It's located under the "Frontend >> Type of page" conditional. Props to Emmanuel A. for prompting this improvement.
  * add a note in the module about manually activating safe mode to regain access to wp-admin when a PHP snippet triggers a pervasive fatal error.

* **[IMPROVED in Pro] Admin Interface >> Admin Columns Manager**: 
  * When all active columns are set to auto width, horizontal scrolling will automatically be disabled in the list table of posts. This ensures that the righ-border-line for the first column will not be displayed in such a scenario.
  * Add an option to make the column header row sticky (on top) on scroll.
  * Add an option to set the number of (first) columns to freeze when horizontal scrolling is enabled.

* **[TRANSLATION in Free and Pro]** ASE is now being translated into [38 languages](https://translate.wpase.com/):
  * **Added new/improved translation** for:
    * ASE Free - Updated Vietnamese, Russian, Portuguese (Brazil), Polish, Norwegian, Dutch (Belgian), Dutch, Bengali (Bangladesh)
    * ASE Pro - Indonesian, Vietnamese, Polish, Norwegian, Portuguese (Brazil).