Make a few properties public
so the callback and the integrate_issue_like can use them.

Signed-off-by: Suki <suki@missallsunday.com>
Nope! lets use a getter instead...

Signed-off-by: Suki <suki@missallsunday.com>
Allow overwritten the existing _validLikes options
and avoid having to specifically declare them on every call

Signed-off-by: Suki <suki@missallsunday.com>
Add another param to stop creating the default alert when someone likes a content
this way a mod author can fire their own cusotm alert with their own custom arguments.

Signed-off-by: Suki <suki@missallsunday.com>