Added the ability to copy the contents of column headers by using 3 new context menu options: 'Copy with headers', 'Copy with group headers', and 'Copy headers only'.
Added 4 new API methods for copying column headers programmatically: 'copyCellsOnly()', 'copyWithColumnHeaders()', 'copyWithAllColumnHeaders()', and 'copyColumnHeadersOnly()'.
Added translations for the new context menu options in:
Arabic.
Czech.
English.
Spanish.
Italian.
Latvian.
Norwegian.
Dutch.
Polish.
Added missing TypeScript definitions of 'CellCoords' and 'CellRange' classes, which are used in the arguments of some APIs.
Added missing TypeScript definitions for the following Handsontable hooks: 'beforeColumnFreeze', 'afterColumnFreeze', 'beforeColumnUnfreeze', and 'afterColumnUnfreeze'.