Allow TextLocation to be created (simonbs#372)

Author: migueldeicaza

Sources/Runestone/TextView/Navigation/TextLocation.swift

@@ -7,6 +7,12 @@ public struct TextLocation: Hashable, Equatable {
     /// Column in the line.
     public let column: Int
 
+    /// Initializes TextLocation from the given line and column
+    public init (lineNumber: Int, column: Int) {
+        self.lineNumber = lineNumber
+        self.column = column
+    }
+
     init(_ linePosition: LinePosition) {
         self.lineNumber = linePosition.row
         self.column = linePosition.column