Icons are rendered as squares after dialog show or switch to another activity on API 19 and 21
First of all let me thank you for great solutions that you made. I use both your libraries Iconics and Material Drawer in almost all my projects.

## About this issue
Icons are rendered as squares after dialog show or switch to another activity on API 19 and 21 (IconicsTextView, IconicsButton)

## Details
Please see the following short [video](https://drive.google.com/file/d/1C4CqiD1aczRYWwXqmCgCJ-eN9OJ0QTTp/view?usp=sharing) from Firebase Test Lab (0'53 time for example). I've found this during reviewing results of test lab. I don't have physical device with Android 4, I tried to reproduce on virtual device, but unfortunately without success :( On the other hand issue is reproduces 100% on both physical and virtual devices used in Firebase Test Lab (API 19 and 21). No issues on APIs 22+, not able to check on APIs 18-, because Firebase Test Lab provides only 19+ APIs.

Originally I have old version of your libraries, but even I've updated the app to the latest code with AndroidX support, issue still persists.

- Fragment of my layout xml:
```xml
    <LinearLayout
        android:id="@+id/bottom_menu"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="?bottomMenuBg"
        android:gravity="center_horizontal">

        <com.mikepenz.iconics.view.IconicsButton
            android:id="@+id/menu_delete_btn"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:background="?attr/selectableItemBackground"
            android:paddingTop="3dp"
            android:tag="3"
            android:text="{cmd-close-box-outline}"
            android:textColor="?iconsColor"
            android:textSize="33sp" />

        <com.mikepenz.iconics.view.IconicsButton
            android:id="@+id/menu_load_from_file_btn"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:background="?attr/selectableItemBackground"
            android:paddingTop="3dp"
            android:tag="3"
            android:text="{cmd-image}"
            android:textColor="?iconsColor"
            android:textSize="32sp" />

        <com.mikepenz.iconics.view.IconicsButton
            android:id="@+id/menu_camera_btn"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:background="?attr/selectableItemBackground"
            android:paddingTop="3dp"
            android:tag="2"
            android:text="{cmd-camera}"
            android:textColor="?iconsColor"
            android:textSize="35sp" />

        <com.mikepenz.iconics.view.IconicsButton
            android:id="@+id/menu_add_by_keyboard_btn"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:background="?attr/selectableItemBackground"
            android:paddingTop="3dp"
            android:tag="4"
            android:text="{cmd-playlist-plus}"
            android:textColor="?iconsColor"
            android:textSize="35sp" />

        <com.mikepenz.iconics.view.IconicsButton
            android:id="@+id/menu_add_user_btn"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:background="?attr/selectableItemBackground"
            android:paddingTop="3dp"
            android:tag="1"
            android:text="{cmd-account}"
            android:textColor="?iconsColor"
            android:textSize="35sp" />
    </LinearLayout>
```

- Used library version
```gradle
implementation 'com.mikepenz:iconics-core:3.1.0'
implementation "com.mikepenz:iconics-views:3.1.0"
implementation 'com.mikepenz:fontawesome-typeface:4.7.0.2@aar'
implementation 'com.mikepenz:community-material-typeface:2.0.46.1@aar'
implementation 'com.mikepenz:google-material-typeface:3.0.1.2.original@aar'
```
- Used support library version
```gradle
implementation 'androidx.legacy:legacy-support-v4:1.0.0'
implementation 'androidx.browser:browser:1.0.0'
implementation 'androidx.media:media:1.0.0'
implementation 'androidx.recyclerview:recyclerview:1.0.0'
implementation 'androidx.appcompat:appcompat:1.0.2'
implementation "androidx.annotation:annotation:1.0.1"
implementation "androidx.constraintlayout:constraintlayout:2.0.0-alpha3"
implementation 'androidx.paging:paging-runtime:2.0.0'
```

- Used gradle build tools version
```gradle
compileSdkVersion 28
buildToolsVersion '28.0.3'
minSdkVersion 15
targetSdkVersion 26
```

- Used tooling / Android Studio version
3.3.0 Android Studio

- Other used libraries, potential conflicting libraries
```gradle
implementation 'com.mikepenz:materialdrawer:6.1.2'
```