Server: Get rid of libconfuse dependency.

At least for current purposes all the functionality
offered by confuse is not necessary.

Signed-off-by: Peter Tworek <tworaz666@gmail.com>
Server: Fix another two small memory leaks.

Signed-off-by: Peter Tworek <tworaz666@gmail.com>
Server: Add libevent based webserver implementation.

Passing USE_LIBEVENT option to cmake will force basileus to use
libevent instead of shipped version o mongoose web server.

Signed-off-by: Peter Tworek <tworaz666@gmail.com>
WebUI: Only show seeking indicator if seeking is possible.

Signed-off-by: Peter Tworek <tworaz666@gmail.com>