添加安装工具类，并增加把kpmmgr安装到/data/adb/ksu/bin的功能，方便模块调用 (#30)

Co-authored-by: liankong <xhsw.new@qq.com>

manager/app/src/main/java/io/sukisu/ultra/UltraShellHelper.java

@@ -0,0 +1,30 @@
+package io.sukisu.ultra;
+
+import com.topjohnwu.superuser.Shell;
+
+import java.util.ArrayList;
+
+import shirkneko.zako.sukisu.ui.util.KsuCli;
+
+public class UltraShellHelper {
+    public static String runCmd(String cmds) {
+        StringBuilder sb = new StringBuilder();
+        for(String str : KsuCli.INSTANCE.getGLOBAL_MNT_SHELL()
+                .newJob()
+                .add(cmds)
+                .to(new ArrayList<>(), null)
+                .exec()
+                .getOut()) {
+            sb.append(str).append("\n");
+        }
+        return sb.toString();
+    }
+
+    public static boolean isPathExists(String path) {
+        return !runCmd("file " + path).contains("No such file or directory");
+    }
+
+    public static void CopyFileTo(String path, String target) {
+        runCmd("cp -f " + path + " " + target);
+    }
+}