LinkHints detects whether links are completely covered or not

• LinkHints now detects whether links are completely covered or not, and an option can disable this feature
• macOS: fix broken LinkHints when a page is zoomed in (#119)
• fix a regression some keys were not excluded successfully (#115)
• Chrome: fix a regression the hook for click listeners became unsafe in v1.80.1
• fix some bugs when handling vimium://*** URLs (#113)
• add a new command of editText (#114)
• add an option to stop to show notifications on updates (#116)