main is good name for branch

What is new ?

• The upstream branch is now main
• There is new "virtual" column "external-ids" for evidences where extIdSupported == true
• Static definitions updated for AbraFlexi 2021.7.5
• Jenkins now build also packages for Debian 12 Bookworm

What is fixed ?

• Add new date format to RO::flexiDateToDateTime 2017-05-26Z
• rawurlencode() accepts only string, $this->getRecordID() returns ?int
• Fix incompatible types
• Add new date format to RO::flexiDateToDateTime
• restored ability to load from AbraFlexi by array condition
• The logic values parsing should not be done using the boolval function because boolval('true') is true and boolval('false') is also true.
• Fixed the logic values parsing
• #18 fixed by "" as default value of date/time fields instead of null

Many thanks to @serge-tseiko and @petaak for its contributions and patience.