Add ws_event_new to header
Add ws_event_new to event.c
Merge pull request #359 from xVin/add-ws_event_new

[WIP] Add ws event new
Add missing free() call in ws_event_new
Merge pull request #360 from xVin/fix-ws_event_new

Add missing free() call in ws_event_new
Add set_select_lowest to header
Add implementation of ws_set_select_lowest()
Add interface def. for ws_set_select_greatest()
Implement ws_set_select_greatest()
Merge pull request #363 from matthiasbeyer/add-set_greatest_lowest

Implement ws_set_select_greatest/lowest()