Implement clip-linter

[EmilyGraceSeville7cf]

• warn about extra leading/trailing spaces
• warn about trailing punctuation
• warn about sentences not starting with the capital letter
• warn about using / instead of | for alternatives
• warn about using not supported placeholders
• warn about using redundant ranges:
  • 1..1 instead of nothing
  • 0..1 instead of ?
  • 0.. instead of *
  • 1.. instead of +
• warn about not supported placeholders