Support Table Dialect

[peterdesmet]

CHANGELOG: https://datapackage.org/overview/changelog/#table-dialect-new
CHANGELOG: https://datapackage.org/overview/changelog/#dialectschema-new

Table Dialect is the follow up of CSV Dialect and broader in scope.

• Check $schema
  • If not provided, assume v1
  • If v1: investigate effect, likely not much, since all dialect properties frictionless-r wants to support are already in v1
  • If v2: support new properties (currently none)
  • If v2+: warn that it may not understand all properties
• Update any reference to CSV Dialect
• Update properties at https://docs.ropensci.org/frictionless/reference/read_resource.html#csv-dialect (e.g. caseSensitiveHeader and csvddfVersion are removed
• Still only support delimited files
• Assume $schema: https://datapackage.org/profiles/1.0/tabledialect.json
• Figure out if there is a big difference if $schema: https://datapackage.org/profiles/2.0/tabledialect.json is provided