modernize build: drop Scala 2.9.3 & 2.11 modules dependency
remove deprecated 'typelevel' module
nuke deprecated MetricSpace and BKTree
nuke deprecated Length, Each and Index
remove deprecated functions from core
remove deprecated functions from effect
remove some remnants of 2.9
replace use of (Class)Manifest by ClassTag
fix remaining deprecation warnings
fix more deprecation warnings
nuke more deprecated items
remove deprecated 'xml' module