Project overview: Add List mode and filters

[zepich]

The project overview can get messy if there are a lot of projects. For this situation, refactoring the project overview (and the dropdown) would be a good idea.

Add list mode
Instead of the boxes, a list mode with all the projects listed in a table form would be a good addition.

Add filter option
Add a search field and (maybe) additional filter options (active/inactive projects, empty projects) to filter the list of projects.

Add search field to the dropdown
The dropdown in the header should get a search field to search the project by name.