abxLS clean-up

[nhamilakis]

• Removed old abxLS benchmark
• Renamed abxLSPhone ⇾ abxLS
• Migrated Submission verification from old abxLS
• clean-up various parts
• modified abx-sets extraction in ABXTask to use context-mode & speaker mode to determine what which abx to run
• the all option runs: triphone-within, phoneme-within, phoneme-any (so calls the abx2 module 3 times respectively)
• the old speaker_mode (across, within, all) still works as before
• Added handling for the new outputs (