ISourceFormatter::formatSourceWithStyle: take style by reference
This should be faster than copying SourceFormatterStyle at each call of this function. Introduce a QString styleContent variable in CustomScriptPlugin::formatSourceWithStyle() for these reasons: * style is now a reference to const and cannot be assigned to; * the name of an incomplete style matches the name of the corresponding predefined style, so using unmodified style.name() below is correct; * QString content() is the only other member of style used below. Reformat the lines touched by this change. Don't refer to the previous name of kdevcustomscript plugin "indent" in the warning message touched by this change.