More data on frontend Character and Group boxes

[mikron-ia]

Frontend Character and Group display should contain a bit more information:

• amount of data
• possibly count of connections (once they exist)
• possibly indication of last view
• importance category
• favourite or not

This may be connected with reduced amount of them on each screen and widening of the pagination list.

[mikron-ia]

Similarly to #224, this data does not seem useful to be show on the index cards, perhaps except the importance category (which may be done in #252) or favorite status (which is partially done in #253). Rejected as unnecessary.