+ proper build rules based on our other wx programs
+ packaging fixes
+ disable wx debug assertions, as in our other wx programs
+ add osspd to dependencies: without this package wx uses "No sound" device and all wxSound::Play() calls succeed but nothing is played
+ converted mono sound files to stereo: mono files fail to play using osspd
+ depend on next stable szarp-doc-html version, as it will contain the restored docs