Merge branch 'hotfix/0.8.12'
Update EDD_SL_Plugin_Updater to version 1.2.
Fix logic i that determines if cnEntry_Shortcode should process $content for the `cn_entry` shortcode.
Fix cnFormatting::toBoolean().

Check if value is bool and return it if it is.
Otherwise convert value to bool.
Add submit, textarea & hidden to cnHTML.
Re-order before/after list/entry action hooks to be more consistent.
Update changelog.txt.
Update readme.txt.
Bump version to 0.8.13
Merge branch 'hotfix/0.8.13' into develop