rename event types to make common prefix

[Alexey-T]

  TOnFoundTag = procedure(NoCaseTag, ActualTag: string) of object;
  // procedural:
  TOnFoundTagP = procedure(NoCaseTag, ActualTag: string);

  // when text  found in the HTML
  TOnFoundText = procedure(Text: string) of object;
  // procedural:
  TOnFoundTextP = procedure(Text: string);

->

THtmlParserOnFoundTag THtmlParserOnFoundText etc