Use vector drawables for text selection handle

https://github.com/termux/termux-app/issues/1036

terminal-view/src/main/res/drawable/text_select_handle_left_material.xml

@@ -1,4 +1,10 @@
-<?xml version="1.0" encoding="utf-8"?>
-<bitmap xmlns:android="http://schemas.android.com/apk/res/android"
-        android:src="@drawable/text_select_handle_left_mtrl_alpha"
-        android:tint="#2196F3" />
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="48dp"
+    android:height="24dp"
+    android:viewportWidth="132"
+    android:viewportHeight="66">
+  <path
+      android:pathData="M52.3,1.6c-5.7,2.1 -12.9,8.6 -16,14.8 -2.2,4.1 -2.8,6.9 -3.1,14.3 -0.6,12.6 1.3,17.8 9.3,25.8 8,8 13.2,9.9 25.8,9.3 11.1,-0.5 17.3,-3.2 23.5,-10.3 6.5,-7.4 7.2,-10.8 7.2,-34.7l0,-20.8 -21.2,0.1c-16.1,-0 -22.3,0.4 -25.5,1.5z"
+      android:fillColor="#2196F3"
+      android:strokeColor="#00000000"/>
+</vector>

terminal-view/src/main/res/drawable/text_select_handle_right_material.xml

@@ -1,4 +1,10 @@
-<?xml version="1.0" encoding="utf-8"?>
-<bitmap xmlns:android="http://schemas.android.com/apk/res/android"
-        android:src="@drawable/text_select_handle_right_mtrl_alpha"
-        android:tint="#2196F3" />
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="48dp"
+    android:height="24dp"
+    android:viewportWidth="132"
+    android:viewportHeight="66">
+  <path
+      android:pathData="M33,20.8c0,23.9 0.7,27.3 7.2,34.7 6.2,7.1 12.4,9.8 23.5,10.3 12.6,0.6 17.8,-1.3 25.8,-9.3 8,-8 9.9,-13.2 9.3,-25.8 -0.5,-11.1 -3.2,-17.3 -10.3,-23.5 -7.4,-6.5 -10.8,-7.2 -34.7,-7.2l-20.8,-0 0,20.8z"
+      android:fillColor="#2196F3"
+      android:strokeColor="#00000000"/>
+</vector>