request session management

We need to display all sessions with paging, sorted by timeFrom desc.

On click on the session, we show the page /{type}/{id}.

For each session we have the following actions:

• show -> /{type}/{id}
• apply -> /{type}/{id}/apply
• edit-> /{id}/edit
• delete-> /{id}/delete - only if there are not requests

We have filters by:

• active ( timeFrom< now < timeTo)
• type
• semester