Problems after updating Skype and KDE

[tkzv]

I updated a number of programs, including Skype (to 4.3.0.37-r5) and KDE (from 4 to 5). Then I found the following problems:

1. Skype automatically starts with KDE. I did not find it in any GUI configuration tools.

2. What's worse, when it autostarts, sound doesn't work (I use Apulse library).

3. No tray icon for Skype. Installing dev-libs/sni-qt[abi_x86_32] and restarting KDE didn't help.

How do I disable autostart? Why didn't Skype see Apulse? How do I enable Skype tray icon?

net-im/skype-4.3.0.37-r5
dev-libs/sni-qt-0.2.6-r1
kde-apps/kdebase-meta-15.12.3
kde-plasma/kdecoration-5.5.5

PARTIAL ANSWERS:
1. Disabled by grepping for "skype" in ~/.config/ and removing every occurrence. It didn't come back.
3. Same problem for 64-bit prgrams too: https://forums.gentoo.org/viewtopic-t-1047746.html — solved.