Update the build system

scripts.hxml

@@ -1,2 +1,3 @@
 --class-path scripts
 --class-path src
+--library tink_core

scripts/Clean.hx

@@ -1,9 +1,22 @@
 import sys.FileSystem;
 using Lambda;
+using haxe.io.Path;
 
 /** Deletes all generated files. **/
 function main() {
 	["js", "js.map"].map(ext -> 'bin/setup_hashlink.$ext').filter(FileSystem.exists).iter(FileSystem.deleteFile);
-	["lib", "res"].filter(FileSystem.exists).iter(Tools.removeDirectory);
-	Tools.cleanDirectory("var");
+	["lib", "res"].filter(FileSystem.exists).iter(removeDirectory);
+	cleanDirectory("var");
+}
+
+/** Recursively deletes all files in the specified `directory`. **/
+private function cleanDirectory(directory: String) for (entry in FileSystem.readDirectory(directory).filter(entry -> entry != ".gitkeep")) {
+	final path = Path.join([directory, entry]);
+	FileSystem.isDirectory(path) ? removeDirectory(path) : FileSystem.deleteFile(path);
+}
+
+/** Recursively deletes the specified `directory`. **/
+private function removeDirectory(directory: String) {
+	cleanDirectory(directory);
+	FileSystem.deleteDirectory(directory);
 }

scripts/Version.hx

@@ -1,8 +1,13 @@
 //! --class-path src --library tink_core
 import setup_hashlink.Platform;
+import sys.io.File;
 
 /** Updates the version number in the sources. **/
 function main() {
-	Tools.replaceInFile("package.json", ~/"version": "\d+(\.\d+){2}"/, '"version": "${Platform.packageVersion}"');
-	Tools.replaceInFile("README.md", ~/action\/v\d+(\.\d+){2}/, 'action/v${Platform.packageVersion}');
+	replaceInFile("package.json", ~/"version": "\d+(\.\d+){2}"/, '"version": "${Platform.packageVersion}"');
+	replaceInFile("README.md", ~/action\/v\d+(\.\d+){2}/, 'action/v${Platform.packageVersion}');
 }
+
+/** Replaces in the specified `file` the substring which the `pattern` matches with the given `replacement`. **/
+private function replaceInFile(file: String, pattern: EReg, replacement: String)
+	File.saveContent(file, pattern.replace(File.getContent(file), replacement));