Strategy changes + ephemeral nodes (#71)

3 main contributions from this PR 

1. Updated our save strategy to now automatically create a checkpoint
every 25 nodes (number changeable when initializing trrack) and
otherwise always save patch nodes.
2. Made it possible to directly force a single node to be a checkpoint 
3. Added back idea of ephemeral nodes, and made undo/redo chain skip
over ephemeral nodes. More work should be done in trrack vis to account
for ephemeral nodes as well.

Author: ZachCutler04

package.json

@@ -123,3 +123,4 @@
     }
   }
 }
+

packages/core/package.json

@@ -8,14 +8,15 @@
         "url": "https://github.com/Trrack/trrackjs.git"
     },
     "dependencies": {
+        "@reduxjs/toolkit": "^1.9.1",
+        "@semantic-release/changelog": "^6.0.3",
         "fast-json-patch": "^3.1.1",
-        "uuid": "^9.0.0",
-        "@reduxjs/toolkit": "^1.9.1"
+        "uuid": "^9.0.0"
     },
     "peerDependencies": {
+        "@reduxjs/toolkit": "^1.9.1",
         "fast-json-patch": "^3.1.1",
-        "uuid": "^9.0.0",
-        "@reduxjs/toolkit": "^1.9.1"
+        "uuid": "^9.0.0"
     },
     "exports": {
         ".": {

yarn.lock

@@ -3318,6 +3318,16 @@
     argparse "~1.0.9"
     string-argv "~0.3.1"
 
+"@semantic-release/changelog@^6.0.3":
+  version "6.0.3"
+  resolved "https://registry.yarnpkg.com/@semantic-release/changelog/-/changelog-6.0.3.tgz#6195630ecbeccad174461de727d5f975abc23eeb"
+  integrity sha512-dZuR5qByyfe3Y03TpmCvAxCyTnp7r5XwtHRf/8vD9EAn4ZWbavUX8adMtXYzE86EVh0gyLA7lm5yW4IV30XUag==
+  dependencies:
+    "@semantic-release/error" "^3.0.0"
+    aggregate-error "^3.0.0"
+    fs-extra "^11.0.0"
+    lodash "^4.17.4"
+
 "@semantic-release/commit-analyzer@^9.0.2":
   version "9.0.2"
   resolved "https://registry.yarnpkg.com/@semantic-release/commit-analyzer/-/commit-analyzer-9.0.2.tgz#a78e54f9834193b55f1073fa6258eecc9a545e03"