Add Luau vector library (#624)

Adds vector library to Luau standard library

Reference:
https://luau.org/library#vector-library

---------

Co-authored-by: boyned//Kampfkarren <[email protected]>

CHANGELOG.md

@@ -6,6 +6,7 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 - Added `Path2DControlPoint.new`, `Content.fromUri`, `Content.fromAssetId`, and `Content.fromObject` to the Roblox standard library
 - [Adds `lua_versions` to standard library definitions](https://kampfkarren.github.io/selene/usage/std.html#lua_versions). Specifying this will only allow the syntax used by those languages. The default standard libraries now specify these, meaning that invalid syntax for that language will no longer be supported.
 - Added missing third parameter to `PathWaypoint.new` in the Roblox standard library
+- Added `vector` library to Luau standard library
 - Added `math.map` to the Luau standard library
 
 ### Changed
@@ -443,4 +444,4 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 - Added standard library chaining. This means you can combine two standard libraries by setting `std` in selene.toml to `std1+std2`. You can chain as many as you want.
 
 ## [0.1.0](https://github.com/Kampfkarren/selene/releases/tag/0.1.0) - 2019-11-06
-- Initial release
+- Initial release

selene-lib/default_std/luau.yml

@@ -457,3 +457,90 @@ globals:
       - required: false
         type: number
     must_use: true
+  vector.abs:
+    args:
+      - type:
+          display: vector
+    must_use: true
+  vector.angle:
+    args:
+      - type:
+          display: vector
+      - type:
+          display: vector
+      - required: false
+        type:
+            display: vector
+    must_use: true
+  vector.ceil:
+    args:
+      - type:
+          display: vector
+    must_use: true
+  vector.clamp:
+    args:
+      - type:
+          display: vector
+      - type:
+          display: vector
+      - type:
+          display: vector
+    must_use: true
+  vector.create:
+    args:
+      - type: number
+      - type: number
+      - type: number
+    must_use: true
+  vector.cross:
+    args:
+      - type:
+          display: vector
+      - type:
+          display: vector
+    must_use: true
+  vector.dot:
+    args:
+      - type:
+          display: vector
+      - type:
+          display: vector
+    must_use: true
+  vector.floor:
+    args:
+      - type:
+          display: vector
+    must_use: true
+  vector.magnitude:
+    args:
+      - type:
+          display: vector
+    must_use: true
+  vector.max:
+    args:
+      - type:
+          display: vector
+      - type: "..."
+        required: false
+    must_use: true
+  vector.min:
+    args:
+      - type:
+          display: vector
+      - type: "..."
+        required: false
+    must_use: true
+  vector.normalize:
+    args:
+      - type:
+          display: vector
+    must_use: true
+  vector.one:
+    property: read-only
+  vector.sign:
+    args:
+      - type:
+          display: vector
+    must_use: true
+  vector.zero:
+    property: read-only