[PATCH] Add override specifier

[Yuriy Skalko]

Hello,

I've added `override` specifiers into the LyX codebase. This will
improve code maintainability in future. To find overridden methods I've
used the Cppcheck static analyzer. Probably some are missed and should
be marked later.

Jean-Marc already marked some of such methods in commit c8f4b684, I've
continued this job.


Yuriy
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