Check if links are valid #28
Description
When creating a link inside a javadoc, it should be checked if a link is valid. The implementation will work closely with #27 since this will also need indexing. During this indexing it is probably rather easy to check the validity of mappings.
When rendering the javadocs invalid mappings will be shown in red.
Are there any other ways it should be shown that a javadoc link is invalid? Maybe a seperate tab, or an orange warning with a tooltip like the warning checker. Suggestions are welcome.