Supporting "Open in Safari" for Opera browser

1. releasing process on Windows OS for "exec" command
2. adding an uninstaller script for Windows OS

1. Fixes a bug in 0.2.1 to prevent attaching NodeJS when it is available on user's system

1. Printing more logs during the installation
2. Allowing to define custom directory in Linux and Mac using --custom-dir argument

Supporting "Open in VLC media player" for Chrome

Duplicate of 0.1.8; fixed a typo on "External Application Button" id for Firefox

Supporting "External Application Button" extension

Supports "Open In GIMP" for Chrome and Opera

Supporting "Media Converter" by @inbasic for Firefox browser

Supporting "Media Converter and Muxer" by @inbasic for Chrome and Opera