💻 Collection of developer tool improvements (mainly editor)

This is meant as a collection for various improvements I'd like to get to sometime in the next months.
Feel free to add your own and/or provide feedback/thoughts on the ones listed:

• Code Folding (e.g. collapse an if block)
• Line Numbering (see #42 and #152)
• Useful Naming of Editor Windows (at least the module name should always be present!)
• Swap File Support (i.e. save the contents of an text editor every few seconds, without formatting/evaluating it, just to not loose code)
• TODO and FIXME comments are currently highlighted in the code, this should be done via markers, so that they are displayed on the code map
• One should be able to open the code map without the search widget~~
• in general, the text map (with and without search widget) should become a bit more robust. It happens often, that one uses e.g. the scrollbar to scroll in the text and doing so will results in the text map being closed
• Improve the search widget (i.e. affordable regex and case-(in)sensitive settings)
• Git Blame (multiline blame) is currently nearly impossible to read, should be improved upon
• It should never be possible to accidentaly browse in non-focused browsers. The keyboard navigation needs to respect unsaved changes!