DBI breaking changes

• v1.2.3 \u2192 v1.3.0breaking

  Many generics in the package are now a `"nonstandardGeneric"` instead of a `"standardGeneric"`: The `def` argument to `methods::setClass()` changed from a direct call to `methods::standardGeneric()` to a function that wraps `methods::standardGeneric()`. This should not affect most users, but became apparent with the tests in the dittodb package failing and is listed here for completeness. See <https://github.com/ropensci/dittodb/pull/197> for detail.

• v1.1.3 \u2192 v1.2.0breaking

  `dbUnquoteIdentifier()` creates `Id()` objects without component names and allows non-`NA` character input (#421, #422).

• v0.7 \u2192 v0.8breaking

  `SQL()` now strips the names from the output if the `names` argument is unset.

• v0.7 \u2192 v0.8breaking

  The `dbReadTable()`, `dbWriteTable()`, `dbExistsTable()`, `dbRemoveTable()`, and `dbListFields()` generics now specialize over the first two arguments to support implementations with the `Id` S4 class as type for the second argument. Some packages may need to update their documentation to satisfy R CMD check again. New generics ------------

• v0.7 \u2192 v0.8breaking

  Schema support: Export `Id()`, new generics `dbListObjects()` and `dbUnquoteIdentifier()`, methods for `Id` that call `dbQuoteIdentifier()` and then forward (#220).

• v0.7 \u2192 v0.8breaking

  New `dbQuoteLiteral()` generic. The default implementation uses switchpatch to avoid dispatch ambiguities, and forwards to `dbQuoteString()` for character vectors. Backends may override methods that also dispatch on the second argument, but in this case also an override for the `"SQL"` class is necessary (#172). Default implementations -----------------------

• v0.7 \u2192 v0.8breaking

  Default implementations of `dbQuoteIdentifier()` and `dbQuoteLiteral()` preserve names, default implementation of `dbQuoteString()` strips names (#173).

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