[qbee.py] Load & run file passed through command line

Signed-off-by: Anton D. Kachalov <mouse@yandex.ru>
[lib/qb/rpc] Cleanup

Signed-off-by: Anton D. Kachalov <mouse@yandex.ru>
[lib/qb/console] Skip nested class definitions

Signed-off-by: Anton D. Kachalov <mouse@yandex.ru>
Ignore __pycache__

Signed-off-by: Anton D. Kachalov <mouse@yandex.ru>
[qbee] Set PS1 and Banner

Signed-off-by: Anton D. Kachalov <mouse@yandex.ru>
[src/_core] qb_interface_t: __repr__ use type's name instead of hardcoded "qb_interface_t"

Signed-off-by: Anton D. Kachalov <mouse@yandex.ru>