A.F.I..... [ZBXNEXT-875] implemented map element stacking order control
* commit '3f687a6fe578533eab76bf1fb0fc113babd8280d': (29 commits)
.......... [ZBXNEXT-875] added missing unit test for new import converter
....I..... [ZBXNEXT-875] fixed DB upgrade patch versions mismatch
.......... [ZBXNEXT-875] fixed Selenium test - adjusted API request, added correct xpath for the label check
.......... [ZBXNEXT-875] fixed typo
..F....... [ZBXNEXT-875] fixed potential undefined array key when map is not found
.......... [ZBXNEXT-875] fixed typo
..F....... [ZBXNEXT-875] reverted code responsible for setting values to form after element has been moved
..F....... [ZBXNEXT-875] fixed map element zindex being calculated from highest zindex instead of element count
..F....... [ZBXNEXT-875] fixed line shapes changing size on their own, minor code refactoring
..F....... [ZBXNEXT-875] fixed mass shape form border width being reset to empty field, minor code refactoring
..F....... [ZBXNEXT-875] removed observer.js and refactored code to update element and form fields using a public function instead
..F....... [ZBXNEXT-875] change border with to numeric box
..F....... [ZBXNEXT-875] fixed coding style
A......... [ZBXNEXT-875] fixed default zindex value being taken from DB in the converter chain when importing from older version
..F....... [ZBXNEXT-875] fixed JS error regarding an undefined variable when removing a link while element form with link subform is still active
..F....... [ZBXNEXT-875] minor coding style fixes and refactoring
..F....... [ZBXNEXT-875] minor coding style fixes
.......... [ZBXNEXT-875] added changelog file
A.F....... [ZBXNEXT-875] added map element zindex in import/export, fixed API test message
..F....... [ZBXNEXT-875] fixed issue having same amount of elements, but different IDs, fixed typo
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