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.

editor/debugger/debug_adapter/debug_adapter_parser.cpp

@@ -34,6 +34,7 @@
 #include "editor/debugger/script_editor_debugger.h"
 #include "editor/editor_node.h"
 #include "editor/editor_run_native.h"
+#include "editor/plugins/script_editor_plugin.h"
 
 void DebugAdapterParser::_bind_methods() {
 	// Requests