V4.4.0: Rewritten BE module

Added

• Add EventStatisticsCalculator and Event/EventStatistics (#2101, #2102)
• Add more Event properties and repository methods (#2089, #2124)
• Add a rewritten BE module for TYPO3 >= 10LTS
  (#2074, #2075, #2076, #2077, #2078, #2084, #2085, #2088, #2094, #2095, #2097
  #2100, #2105, #2109, #2113, #2114, #2116, #2120, #2122, #2123, #2125, #2126,
  #2129, #2137, #2139, #2145, #2146, #2148, #2151)
• Add an SVG icon for the BE module (#2071)

Changed

• !!! Move the EventTitleAndDateAndUid partial around (#2119)
• Clean up the Fluid templates (#2092)
• Use a different hue of orange in the extension icon (#2070, #2071)

Deprecated

• Deprecate the charsetForCsv setting (#2108)

Fixed

• Fix the camelCase of a Fluid variable in the FE editor templates (#2091)