Update default import settings / Make import process easier

[Daveiano]

The structure of the exported data (header names) seems to vary by:

• The configured language of your device
• Configured units
• Model and manufacturer: e.g. AW WS-5000 "Wind Gust (mph)" or "Ultra-Violet Radiation Index" vs AW WS-2000 "Gust (km/h)" and "UVI"

Possible ideas

• Detect the headers and units automatically:
  • Characteristics name could be stored and translated in a json
  • Unit could be parsed: seems to be every time in "()"

Tasks

• Update the default settings (column names and time setting) to match the most common standard for these exports
• Add a "Clear database" button to clean up everything after a failed import

Also, see https://www.wxforum.net/index.php?topic=43516.msg443354#msg443354