Add an indicator for selected mappings in mapping search and mapping navigator

[DennisTobola]

You'll be able to find your current mapping faster, also if there are duplicate mappings, you won't know which you selected.
An example would be the same background coloring as selected concepts.

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Or make it the same color used for the mapping browser in general to have continuity with our color palette and also organize the different sections with their own colors.

I would rather take the latter, but that's just my opinion.

[stefandesu]

This is actually there in theory, but for some reason it doesn't seem to work anymore. Will fix tomorrow.

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[stefandesu]

I liked your idea of using the same highlight color as in ConceptTree, so that's how I implemented it now.