This change switches the search box in the search view from QLineEdit to the derived QtSmartSearchBox implementation,
which is capeable of displaying tokens of the query as selectable button elements in different colors. It allows for all
the usual mouse and keyboard interactions that the QLineEdit offers.
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* updated spacings and colors in QtCodeView and QtCodeFile
* using Source Code Pro Regular (had to remove light cut from the Fonts folder because it got always used)
* updated syntax highlighted colors to fit design
* changed colors of highlights
* indent all QtCodeSnippets by maximum line number in QtCodeFile
* fixed syntax highlighting to work with sole multiline comment end
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