Update lkt to add the following commands:

Queue search

• lkt queue pos <pos> get the song with the position <pos> in the queue
• lkt queue pos <from:to> same but with a range
• lkt queue <count> get the next <count> songs in the queue
• lkt search queue <query> search in the queue for all songs matching the <query>

Queue manipulation

• lkt queue pop [pos] delete and go to next kara in the queue, the [pos] is optional
• lkt queue seek <id> go to the song the id <id>
• lkt queue delete <id> the song that has the id <id> in the queue
• lkt queue clear clear the queue
• lkt queue crop crop the queue

Solved issue(s)

Closes #30 (closed)