Editor: Cleanup some includes dependencies

Removes some unnecessary includes from `editor_node.h`, and instead add
those where they're used.

Removes unnecessary `editor_node.h` includes in various editor classes.

Renames `dynamicfont` to `dynamic_font` in a couple files.

Misc cleanup while jumping through that rabbit hole.

main/main.cpp

@@ -81,6 +81,7 @@
 #include "editor/doc_data_class_path.gen.h"
 #include "editor/doc_tools.h"
 #include "editor/editor_node.h"
+#include "editor/editor_paths.h"
 #include "editor/editor_settings.h"
 #include "editor/editor_translation.h"
 #include "editor/progress_dialog.h"