[Editing] #347 Implemented way better tooltips with integrated D code highlighting.
Semantic highlighting and DDoc macro infrastructure are still missing though.
[Gui/Tooltips] Nested DDoc macros.
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[Editing/Tooltips] Redesign of class architecture/Implemented static node signature generation
[Editing/Tooltips] First param tooltip tests. Preparing for more decent display of deduced [template] parameters/base types