feat: multi-selection with keyboard

[Mykhailo-Roit]

• Multi-line selection with Shift + Up/Down for continuous entries
• multi-line selection by Shift + click on last line
• Multi-line selection with Ctr + click for non-continuous entries
• "space" for checking/unchecking current line or selected lines

[Micke-K]

Hello,

Sorry, I completely forgot about the PRs. I did look into this and this looks like it will break sorting. I need to test this and verify existing functionality is not impacted.

Also, PRs should be against the Development branch for fully test before release.

Cheers!