Proposal: change listview in GenreMoodPage into gridview

[rgrnetalk]

I have changed the listview in the genremoodpage into a gridview. This has two advantages:

1. scrolling is limited
2. you can have all genres in one page *)
   and one disadvantage:
3. long genre names don't fit.
   *) Only when the retrieve genre call is changed so that all genres are retreived in one call (then you don't have to use the load previous/next set menu), this can be done by changing the line property int limit: app.searchLimit.value into property int limit: 45
   Here's the new page (with the original app.searchLimit.value):
   

[ksiazkowicz]

1. What about making genre name multiline?
2. Can you make a PR?