Fix initial config error with cardinal letters.

Fixes:

• Initial cardinal direction letters configuration when adding card now works. Fixes #101

Some small display fixes

Fixes:

• Margin calculation when speedbars are hidden. Fixes #97
• Background image position fixed when using longer cardinal direction labels.
• Small fix in measurement matching

Revert entity config check method

Fix

• Entity check code, revert to previous method.

Fix text position error on Safari/iOS

Fixes:

• Text position error on Safari/MacOS/iOS, Tspan was added by the SVG library, causing padding issues.

Fix current wind animation and display precision.

v1.11.3

Fixes:

• Changed current wind direction arrow animation to take the shortest route to next wind direction. Fixes #94
• Change from buggy Snap SVG library to SVG.js library. Needed for above fix.
• Changed text alignments in the speed bar.
• Corner info now using configured display precision. Fixes #92

Data_period Cconfig check fix

Fix: Data_period Cconfig check fix

Remember, the hours_to_show property is deprecated since version 1.2.0
It moved to the data_period object.

hours_to_show: 5    // deprecated
data_period:             // new
  hours_to_show: 5

Fix: handle no wind periods better

Fix: handles no wind periods better. Fixes #86

Matching stategy time-frame fix and direction label can be words.

New feature:

• Possible to display words instead of letters on the cardinal direction points on the windrose. Fixes #82
  Its not perfect, because of the margin used in combination with auto rotation and the display of corner info.
  Some text can overlap.

Fixes:

• Matching strategy time-frame did not work for direction sensor using letters. Fixes: #64
• The direction_letters property wasn't used, instead the cardinal_direction_letters property was also used to parse states.

Backgroud image support and new match strategy.

Features:

• Background image support. Fixes #54
• New match strategy: time_frame. See ReadMe.md for more info. Fixes #64

Show state in the corners and fixes.

Feature:

• display entity states in the corners around the windrose.
  Fixes:
• when wind speed is calm for longer time and there are no leafs to display, show the legend circles with default percentages.
• when during configuration of your card an error occurs an SVG element was added to the DOM. Fixes #79
• when compass direction (for auto rotate) is undefined, default to north, 0 degrees.