Drop support for kitkat; Bump minSdk to 21

This has been dead for a while already, remove the code and bump minSdk to a
version that actually works

Signed-off-by: Aayush Gupta <aayushgupta219@gmail.com>

app/src/main/res/layout/activity_main.xml

@@ -76,9 +76,10 @@
         android:layout_width="wrap_content"
         android:layout_height="match_parent"
         android:layout_gravity="start"
-        android:background="?android:attr/colorBackground"
+        android:background="?android:attr/windowBackground"
         android:overScrollMode="never"
         app:headerLayout="@layout/layout_nav_header"
+        app:itemIconTint="?android:attr/colorAccent"
         app:itemTextAppearance="@style/TextAppearance.Aurora.Line1"
         app:menu="@menu/menu_drawer" />
 </androidx.drawerlayout.widget.DrawerLayout>

app/src/main/res/layout/item_preference.xml

@@ -33,7 +33,7 @@
         android:layout_height="@dimen/icon_size_default"
         android:layout_gravity="center"
         android:layout_marginStart="@dimen/margin_small"
-        app:tint="@color/colorAccent"
+        app:tint="?android:attr/colorAccent"
         app:tintMode="src_in" />
 
     <RelativeLayout

app/src/main/res/layout/layout_details_install.xml

@@ -23,7 +23,7 @@
     android:id="@+id/bottomSheet"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
-    android:background="?colorAccent"
+    android:background="@drawable/bg_bottomsheet"
     android:divider="@drawable/divider"
     android:orientation="vertical"
     android:paddingStart="@dimen/padding_small"
@@ -67,6 +67,7 @@
                 android:layout_height="@dimen/icon_size_small"
                 android:layout_centerVertical="true"
                 android:layout_toStartOf="@id/img_cancel"
+                android:indeterminateTint="@color/colorScrim"
                 android:progressDrawable="@drawable/progressbar_bg"
                 tools:progress="40" />
 

app/src/main/res/layout/sheet_base.xml

@@ -20,7 +20,7 @@
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
-    android:background="?android:colorBackground"
+    android:background="@drawable/bg_sheet"
     android:orientation="vertical">
 
     <FrameLayout

app/src/main/res/layout/view_app.xml

@@ -40,7 +40,6 @@
         android:layout_centerHorizontal="true"
         android:layout_marginTop="@dimen/margin_small"
         android:maxLines="2"
-        android:scrollHorizontally="true"
         android:textAppearance="@style/TextAppearance.Aurora.Line2"
         android:textColor="?android:textColorPrimary"
         tools:text="App Name" />

app/src/main/res/layout/view_dash.xml

@@ -29,7 +29,7 @@
         android:layout_width="@dimen/icon_size_default"
         android:layout_height="@dimen/icon_size_default"
         android:layout_centerVertical="true"
-        app:tint="@color/colorAccent" />
+        app:tint="?colorAccent" />
 
     <androidx.appcompat.widget.AppCompatTextView
         android:id="@+id/line1"

app/src/main/res/layout/view_dev_info.xml

@@ -30,7 +30,6 @@
         android:id="@+id/img"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:layout_margin="@dimen/margin_xxsmall"
         app:tint="?colorAccent"
         tools:src="@drawable/ic_download" />