Bind Blender-style translate, rotate and scale shortcuts in the 3D editor

These used to have no binds by default, which severely limited their
discoverability.

The default bindings are the same as in Blender: G for translate, R
for rotate, S for scale.

The default shortcut for the Rotate tool has been moved to Ctrl + R
(Cmd + R) on macOS to accomodate for this change. While this makes
the shortcut less consistent with the usual "Q-W-E-R-T" line of shortcuts,
quick rotation with Blender-style transforms is arguably more convenient
during day-to-day editor operation. To avoid breaking people's muscle memory,
we should try to use shortcuts as similar as possible to Blender's.

The S key is only used for scaling if not currently in freelook mode.

Author: Calinou

editor/plugins/node_3d_editor_plugin.cpp

@@ -5381,9 +5381,9 @@ Node3DEditorViewport::Node3DEditorViewport(Node3DEditor *p_spatial_editor, int p
 	ED_SHORTCUT("spatial_editor/lock_transform_xz", TTR("Lock Transformation to XZ plane"), KeyModifierMask::SHIFT | Key::Y);
 	ED_SHORTCUT("spatial_editor/lock_transform_xy", TTR("Lock Transformation to XY plane"), KeyModifierMask::SHIFT | Key::Z);
 	ED_SHORTCUT("spatial_editor/cancel_transform", TTR("Cancel Transformation"), Key::ESCAPE);
-	ED_SHORTCUT("spatial_editor/instant_translate", TTR("Begin Translate Transformation"));
-	ED_SHORTCUT("spatial_editor/instant_rotate", TTR("Begin Rotate Transformation"));
-	ED_SHORTCUT("spatial_editor/instant_scale", TTR("Begin Scale Transformation"));
+	ED_SHORTCUT("spatial_editor/instant_translate", TTR("Begin Translate Transformation"), Key::G);
+	ED_SHORTCUT("spatial_editor/instant_rotate", TTR("Begin Rotate Transformation"), Key::R);
+	ED_SHORTCUT("spatial_editor/instant_scale", TTR("Begin Scale Transformation"), Key::S);
 
 	preview_camera = memnew(CheckBox);
 	preview_camera->set_text(TTR("Preview"));
@@ -8555,7 +8555,7 @@ Node3DEditor::Node3DEditor() {
 	tool_button[TOOL_MODE_SCALE]->set_toggle_mode(true);
 	tool_button[TOOL_MODE_SCALE]->set_theme_type_variation("FlatButton");
 	tool_button[TOOL_MODE_SCALE]->connect(SceneStringName(pressed), callable_mp(this, &Node3DEditor::_menu_item_pressed).bind(MENU_TOOL_SCALE));
-	tool_button[TOOL_MODE_SCALE]->set_shortcut(ED_SHORTCUT("spatial_editor/tool_scale", TTR("Scale Mode"), Key::R));
+	tool_button[TOOL_MODE_SCALE]->set_shortcut(ED_SHORTCUT("spatial_editor/tool_scale", TTR("Scale Mode"), KeyModifierMask::CMD_OR_CTRL | Key::R));
 	tool_button[TOOL_MODE_SCALE]->set_shortcut_context(this);
 	tool_button[TOOL_MODE_SCALE]->set_tooltip_text(keycode_get_string((Key)KeyModifierMask::CMD_OR_CTRL) + TTR("Drag: Use snap.") + "\n" + TTR("Alt+RMB: Show list of all nodes at position clicked, including locked."));