Update workflow to latest standards + add test projects (#102)

* Move test-project to subfolder

* Update workflow to target test-project

* Add 2018.3-legacy test-project

* Rename to legacy-render-pipeline

* Add test project for URP

* Cache LFS

* Update license

* Ignore artifacts

* Add test project for HDRP

* Avoid ambiguity in cache key

test-projects/test-project/Assets/Scripts/BasicCounter.cs

@@ -0,0 +1,18 @@
+using System;
+
+public class BasicCounter
+{
+  public const int MaxCount = 10;
+
+  public BasicCounter(int count = 0)
+  {
+    Count = count;
+  }
+
+  public void Increment()
+  {
+    Count = Math.Min(MaxCount, Count + 1);
+  }
+
+  public int Count { get; private set; }
+}

test-projects/test-project/Assets/Scripts/BasicCounter.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: b3127635e04181a4f8b926030456b80b
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

test-projects/test-project/Assets/Scripts/MyScripts.asmdef

@@ -0,0 +1,12 @@
+{
+    "name": "MyScripts",
+    "references": [],
+    "includePlatforms": [],
+    "excludePlatforms": [],
+    "allowUnsafeCode": false,
+    "overrideReferences": false,
+    "precompiledReferences": [],
+    "autoReferenced": true,
+    "defineConstraints": [],
+    "versionDefines": []
+}

test-projects/test-project/Assets/Scripts/MyScripts.asmdef.meta

@@ -0,0 +1,7 @@
+fileFormatVersion: 2
+guid: a766bbe5cb4e1474f8242df5302fd869
+AssemblyDefinitionImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: