Remove deprecated ignore_* and skip_* options

[mkniewallner]

ignore_* and skip_* options have been deprecated in 0.12.0, with warnings about their deprecation and replacements. We could completely remove them in a new minor release, since we are still using 0.x versioning scheme.

This would effectively remove the following options:

• with replacements in [tool.deptry]:
  • ignore_misplaced-dev -> replaced with ignore = ["DEP004"]
  • ignore_missing -> replaced with ignore = ["DEP001"]
  • ignore_obsolete -> replaced with ignore = ["DEP002"]
  • ignore_transitive -> replaced with ignore = ["DEP003"]
  • ignore_unused -> replaced with ignore = ["DEP002"]
• with replacements in [tool.deptry.per_rule_ignores]:
  • skip_misplaced_dev -> replaced with DEP004 = ["dep", ...]
  • skip_missing -> replaced with DEP001 = ["dep", ...]
  • skip_obsolete -> replaced with DEP002 = ["dep", ...]
  • skip_transitive -> replaced with DEP003 = ["dep", ...]
  • skip_unused -> replaced with DEP002 = ["dep", ...]

In order to facilitate the removal of those options, #571 would be really nice to have, as without it, removed options that are still set in [tool.poetry] will be ignored instead of raising an error.