Add full support for Mac-specific keyboard layouts (#736)

* IPP for Mac, flawed initial experiments

* Cleanup and progress, but not compiling yet

* Fix error and rename nonmac -> standard

* Extentd ipp macros to accomodate mac input

* Add Mac versions of shortcuts; refactor and document the input mapper macros

* Change frontend styling for user input labels in floating menus

* Additional macro documentation

* A little more documentation

* Improve entry macro syntax

* Move input mapper macros to a separate file

* Adapt the keyboard shortcuts to the user's OS

* Display keyboard shortcuts in the menu bar based on OS

* Change Input Mapper macro syntax from {} to ()

* Fix esc key bug in Vue

* Tweaks

* Interim solution for Mac-specific hints

* Feed tooltip input hotkeys from their actions

* Fix hotkeys for tools because of missing actions

* Make Vue respect Ctrl/Cmd differences per platform

* Remove commented lines

* Code review pass by me

* Code review suggestions with TrueDoctor

* Turn FutureKeyMapping struct into ActionKeys enum which is a bit cleaner

* Add serde derive attributes for message discriminants

* Re-add serde deserialize

* Fix not mutating ActionKeys conversion; remove custom serializer

* Add serde to dev dependencies

Co-authored-by: Dennis <dennis@kobert.dev>

frontend/src/components/window/workspace/Panel.vue

@@ -45,8 +45,8 @@
 							<Separator :type="'Unrelated'" />
 						</LayoutCol>
 						<LayoutCol>
-							<UserInputLabel :inputKeys="[['KeyControl', 'KeyN']]" />
-							<UserInputLabel :inputKeys="[['KeyControl', 'KeyO']]" />
+							<UserInputLabel :inputKeys="[[controlOrCommandKey(), 'KeyN']]" />
+							<UserInputLabel :inputKeys="[[controlOrCommandKey(), 'KeyO']]" />
 						</LayoutCol>
 					</LayoutRow>
 				</LayoutCol>
@@ -216,6 +216,8 @@
 <script lang="ts">
 import { defineComponent, PropType } from "vue";
 
+import { operatingSystemIsMac } from "@/utility-functions/platform";
+
 import LayoutCol from "@/components/layout/LayoutCol.vue";
 import LayoutRow from "@/components/layout/LayoutRow.vue";
 import Document from "@/components/panels/Document.vue";
@@ -257,6 +259,10 @@ export default defineComponent({
 		openDocument() {
 			this.editor.instance.document_open();
 		},
+		controlOrCommandKey() {
+			// TODO: Remove this by properly feeding these keys from a layout provided by the backend
+			return operatingSystemIsMac() ? "KeyCommand" : "KeyControl";
+		},
 	},
 	components: {
 		LayoutCol,