Add manifest for ScummVM 2.1.2 (#498)

* Add manifest for ScummVM 2.1.2

* Update description and homepage, fix arch

* Update tags for the ScummVM 2.1.2 manifest

manifests/ScummVM/ScummVM/2.1.2.yaml

@@ -0,0 +1,18 @@
+Id: ScummVM.ScummVM
+Publisher: ScummVM
+Name: ScummVM
+Version: 2.1.2
+License: GPL-2.0
+LicenseUrl: https://github.com/scummvm/scummvm/blob/master/COPYING
+AppMoniker: scummvm
+Tags: scummvm, game, adventure, rpg
+Description: Allows playing numerous adventures and RPGs on modern systems
+Homepage: https://www.scummvm.org/
+Installers:
+  - Arch: x64
+    Url: https://www.scummvm.org/frs/scummvm/2.1.2/scummvm-2.1.2-win32.exe
+    Sha256: 2f4008b5047a6ec2d7d2f2ac108debacfa25b3ae8c0bc0bbb4f826263a78d1ba
+    InstallerType: Inno
+    Switches:
+      Silent: "/VERYSILENT /ALLUSERS"
+      SilentWithProgress: "/VERYSILENT /ALLUSERS"