fix: warn user if watch later options conflict is found

[Samillion]

Fixes: #389

Changes:

• Warn user if watch later options conflict is found, specifically with sub_margins and osd_margins options
  • If sub-pos or osd-margin-y is found in watch later options, warn about the relevant option use
  • By default, osd-margin-y is not added to watch later options, check just in case it was added by user
• Remove deprecated options