Only show one tooltip context at a time

Closes #491

Tooltips can either be in the context of the map (events and NPCs), or
in the context of menus. Menu tooltips will always take priority over
map tooltips.
Allow map events to trigger music changes

Closes #494
Merge pull request #496 from dorkster/music

Allow map events to trigger music changes
Merge pull request #495 from dorkster/bugfixes

Only show one tooltip context at a time
Merge pull request #484 from stefanbeller/master

Recreate pot and po files