fix incorrect diff in comments and descriptions - part 2/2 fixes #719

fix incorrect diff of metadata - part 1/2 fixes #719

make initialization of diff records explicit + revert change regarding property access

upgrade kotlin version

modernize syntax (property access syntax)

move insert methods for issue history to the issue history code fold section

sort issue suggestions by id - resolves #725

add button for creating a new related issue

add filter "only non-blocked" - resolves #674

issue can no longer be linked to themselves - fixes #713

(0) -300 -100 -10 tip

mercurial