Merge branch 'release/1.15'
Merge branch 'release/1.16'
Merge branch 'release/1.17'
Merge branch 'release/1.18'
Merge branch 'release/1.19'
Merge branch 'release/1.20'
Merge branch 'release/1.21'
Merge branch 'release/1.22'
VersionVersion is changed to 1.50
Merge branch 'release/1.50'
Merge branch 'release/1.50' into develop
Fixed JS error after last layer deletion
Merge branch 'hotfix/fix_last_layer_delete' into develop