fixes and additions

-server waits now for an old gap list loader to stop until a new gaplist
is loaded. this can cause a few seconds waiting time for the client but
prevents corrupted gap lists
- get gap list title command added: shows the titles in a specific gap
list. filename has to be sent.
added new command

-supports now get gap list title command
-shows opened gap list on logo view
Merge branch 'master' of https://github.com/Mellich/JukePi