Merged PR 212: Optimize FindChildrenById from O(n) to O(1)

Optimize FindChildrenById from O(n) to O(1):
- Deprecate FindContainerByIdDFS
- Container: Replace Children to string[]
- Add HashMap to IHistoryState that contains all containers

To access a container by id now cost O(1) without any additional cost

+ Implement CICD for SVGLibs

src/utils/saveload.ts

@@ -32,15 +32,22 @@ export function ReviveState(state: IHistoryState): void {
   for (const symbol of state.symbols.values()) {
     symbol.linkedContainers = new Set(symbol.linkedContainers);
   }
+  state.containers = new Map(state.containers);
 
-  const it = MakeDFSIterator(state.mainContainer);
+  const root = FindContainerById(state.containers, state.mainContainer);
+
+  if (root === undefined) {
+    return;
+  }
+
+  const it = MakeDFSIterator(root, state.containers);
   for (const container of it) {
     const parentId = container.properties.parentId;
     if (parentId === null) {
       container.parent = null;
       continue;
     }
-    const parent = FindContainerById(state.mainContainer, parentId);
+    const parent = FindContainerById(state.containers, parentId);
     if (parent === undefined) {
       continue;
     }
@@ -53,6 +60,10 @@ export function GetCircularReplacer(): (key: any, value: object | Map<string, an
     if (key === 'parent') {
       return;
     }
+  
+    if (key === 'containers') {
+      return Array.from((value as Map<string, any>).entries());
+    }
 
     if (key === 'symbols') {
       return Array.from((value as Map<string, any>).entries());