Schema changes to support fileMappings

I updated the schema to draft-07 (the newest VS supports) in order to use the if-else logic.  This allows VS to detect that fileMappings are used and then apply a validation error that `"version"` must be set to 3.0.  (Trying to do it with an anyOf like for destination/defaultDestination would give a fairly ambiguous message instead.)

Author: jimmylewis

src/schema/libman.json

@@ -1,5 +1,5 @@
 {
-  "$schema": "http://json-schema.org/draft-04/schema#",
+  "$schema": "http://json-schema.org/draft-07/schema#",
   "allOf": [
     {
       "anyOf": [
@@ -20,11 +20,19 @@
           "$ref": "#/definitions/defaultDestination"
         }
       ]
+    },
+    {
+      "if": {
+        "$ref": "#/definitions/fileMapping"
+      },
+      "then": {
+        "$ref": "#/definitions/manifestVersion3"
+      }
     }
   ],
   "definitions": {
     "libraryEntry": {
-      "required": ["library"],
+      "required": [ "library" ],
       "properties": {
         "files": {
           "description": "The file names of the individual files to copy to the project.",
@@ -49,19 +57,47 @@
           "description": "The unique identifier of the provider",
           "type": "string",
           "minLength": 1
+        },
+        "fileMappings": {
+          "description": "A list of file mappings.",
+          "type": "array",
+          "items": {
+            "type": "object",
+            "properties": {
+              "root": {
+                "description": "The mapping root within the library contents. If omitted, defaults to the library root.",
+                "type": "string",
+                "minLength": 1
+              },
+              "destination": {
+                "description": "The destination for files included in this mapping. If omitted, defaults to a destination set for the library.",
+                "type": "string",
+                "minLength": 1
+              },
+              "files": {
+                "description": "The file names of the individual files to copy to the project, relative to the specified root. If omitted, defaults to all files.",
+                "type": "array",
+                "default": null,
+                "items": {
+                  "type": "string",
+                  "minLength": 1
+                }
+              }
+            }
+          }
         }
       }
     },
     "specifiedProvider": {
       "properties": {
         "libraries": {
           "items": {
-            "required": ["provider"]
+            "required": [ "provider" ]
           }
         }
       },
       "not": {
-        "required": ["defaultProvider"]
+        "required": [ "defaultProvider" ]
       }
     },
     "defaultProvider": {
@@ -77,12 +113,12 @@
       "properties": {
         "libraries": {
           "items": {
-            "required": ["destination"]
+            "required": [ "destination" ]
           }
         }
       },
       "not": {
-        "required": ["defaultDestination"]
+        "required": [ "defaultDestination" ]
       }
     },
     "defaultDestination": {
@@ -93,6 +129,23 @@
           "minLength": 1
         }
       }
+    },
+    "fileMapping": {
+      "properties": {
+        "libraries": {
+          "contains": {
+            "required": [ "fileMappings" ]
+          }
+        }
+      }
+    },
+    "manifestVersion3": {
+      "properties": {
+        "version": {
+          "const": "3.0"
+        }
+      },
+      "required": [ "version" ]
     }
   },
   "id": "https://json.schemastore.org/libman.json",
@@ -105,12 +158,12 @@
       }
     },
     "version": {
-      "description": "The syntax version of this config file. Can only be 1.0",
-      "enum": ["1.0"],
-      "default": "1.0"
+      "description": "The syntax version of this config file.",
+      "enum": [ "1.0", "3.0" ],
+      "default": "3.0"
     }
   },
-  "required": ["libraries"],
+  "required": [ "libraries", "version" ],
   "title": "JSON schema for client-side library config files",
   "type": "object"
 }