v3.0.0

• Rewrited the whole code.
• Separate code do not show the saving dialog when it's closed.
• If you save on the extracted code tab, it will save the changes in the original file.
• Added shortcut Ctrl + Shift + Alt + S to separate code. (Configurable through File > Preferences > Keyboard Shortcuts)
• Fix bug that when you delete lines before the extracted code in the original tab it would remove that amount of lines to the selection.
• Disabled the creation of multiple synchronized tabs on a single file.
• No longer required the minimum of 1 character to sync.
• Updated README.md.
• Removed screenshots from the package.
• Improved syncronization.
• Changed the highlight methodology.