add tweak to select buildtype for idea version checker
add tweak to select buildtype for idea version checker

also fix compiler warnings in sbt project

SergeevPavel/intellij-scala,LPTK/intellij-scala,SergeevPavel/intellij-scala,LPTK/intellij-scala,triggerNZ/intellij-scala,triggerNZ/intellij-scala,triggerNZ/intellij-scala,JetBrains/intellij-scala-historical,LPTK/intellij-scala,JetBrains/intellij-scala-historical,SergeevPavel/intellij-scala,JetBrains/intellij-scala-historical