v0.8.2

Refactoring

• Make signatures in dbdriver more explicit.
• Make initializeBindings signature more specific.
• Remove auto return type on void returning function.
  Function sendLongData was misleading, as it implied return of some form of error code.
• Add explicit return type for fetchWithStatus.
• Replace problematic size_t alias in DBDriver.
  Replacement is RowIndex_t which is more specific and no longer private.
• Use explicit return type for tellRowOffset.
  Explicit type MYSQL_ROW_OFFSET is important - as exactly this type is
  required as argument for coupled function seekRowOffset.
• Remove fetchColumn method for prepared statements.
  It never worked properly and we've never found a practical usage for it so far, so we ruled it'd better to remove the option altogether. The lower level interface remains available.

Bug fixes

• Fix missing includes.

Other changes

• Update Dockerfile (modern practices, customizable image)
  Upgrade implicit image from mysql 5.7 to 8.0, allow customization via
  TEST_MYSQL_DOCKER_IMAGE environment variable.
• Add Github actions schedule.
• Update image in Github actions.
• Update docker image for tests.
• Polish readme.
• Update readme CI badge.
• Update Github actions.