installer: support AIMP4.
installer: support AIMP4.

Differences between 3 and 4 versions:
1) Program directory is AIMP
2) Version ini file is AIMP.ini
3) App data dir is AIMP

a0ivanov/aimp-control-plugin,a0ivanov/aimp-control-plugin,a0ivanov/aimp-control-plugin,a0ivanov/aimp-control-plugin