Updated for latest Igis version

* Updated to Igis 1.4.0
* Updated to swift-tools-version:5.7
* Removed .dir-locals.el from repository
* Added newly required Swift Atomics

Author: DBenYaakov

.dir-locals.el

@@ -4,3 +4,4 @@
 /*.xcodeproj
 Package.resolved
 *~
+.dir-locals.el

.gitignore

@@ -1,16 +1,18 @@
-// swift-tools-version:4.2
+// swift-tools-version:5.7
 // The swift-tools-version declares the minimum version of Swift required to build this package.
 
 import PackageDescription
 
 let package = Package(
     name: "IgisShell",
     dependencies: [
+      .package(url: "https://github.com/apple/swift-atomics.git", from: "1.0.2")
     ],
     targets: [
         // Targets are the basic building blocks of a package. A target can define a module or a test suite.
         // Targets can depend on other targets in this package, and on products in packages which this package depends on.
-        .target(
-            name: "IgisShell"),
+        .executableTarget(
+          name: "IgisShell",
+          dependencies: [.product(name: "Atomics", package: "swift-atomics")])
     ]
 )

Package.swift

@@ -1 +1 @@
-Igis	1.1.5
+Igis	1.4.0