metahost: add expansions for apply/unapply/update calls, fix various attribute related bugs
metahost: add expansions for apply/unapply/update calls, fix various attribute related bugs

jastice/intellij-scala,triplequote/intellij-scala,JetBrains/intellij-scala,jastice/intellij-scala,ilinum/intellij-scala,ilinum/intellij-scala,ilinum/intellij-scala,loskutov/intellij-scala,loskutov/intellij-scala,loskutov/intellij-scala,jastice/intellij-scala,JetBrains/intellij-scala,triplequote/intellij-scala,jastice/intellij-scala,triplequote/intellij-scala