Mouse modifiers for Media Explorer

[mpl]

We have a section in the Action List for Media Explorer, it also could be useful to customize mouse behaviour for it.

Examples:
1) double click on file - select file->add to selected track/to new track/to selected item as take;
2) shift/ctrl + click - reserved by OS (files selection);
3) left drag (or better say "release after left drag") - add to track / replace item or take source / add as take to selected item.

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