Added context setting: lines above/below the match

https://ksylvestre.itch.io/mightygrep
Added context lines config (lines above/below match)
Signed and notarized macOS builds

added X11 drag/drop

Added hotkey for toggling to system tray

Added taskbar jumplist

MightyGrep: a simple file searching application
https://ksylvestre.itch.io/mightygrep

-Search for file content or filename
-Jump to found line in editor
-Navigate search history with side mouse buttons
-Uses PCRE2
-Single 2MB executable
-Runs on Windows, macOS, and Linux
-Demo for Windows x64