Name adjustments and minor fixes

+ Fix `top-margin` in the choose activity
+ Rename `ViewPager` files for Settings to contain the string 'Settings'
+ Rename `firstStartup` to `Tutorial`
+ Remove unused library imports in `SettingsActivity.kt`

app/src/main/AndroidManifest.xml

@@ -24,7 +24,7 @@
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
-        <activity android:name=".FirstStartupActivity"
+        <activity android:name=".TutorialActivity"
             android:screenOrientation="portrait"
             tools:ignore="LockedOrientationActivity">
         </activity>

app/src/main/java/com/finnmglas/launcher/MainActivity.kt

@@ -86,7 +86,7 @@ class MainActivity : AppCompatActivity(),
 
         // First Startup
         if (!sharedPref.getBoolean("startedBefore", false)){
-            startActivity(Intent(this, FirstStartupActivity::class.java))
+            startActivity(Intent(this, TutorialActivity::class.java))
             tooltipTimer.cancel()
         }
     }

app/src/main/java/com/finnmglas/launcher/SettingsActivity.kt

@@ -1,26 +1,15 @@
 package com.finnmglas.launcher
 
-import android.Manifest
-import android.app.AlertDialog
 import android.content.*
-import android.content.pm.PackageManager
-import android.net.Uri
-import android.os.Build
 import android.os.Bundle
-import android.provider.MediaStore
-import android.provider.Settings
 import android.view.View
 import android.view.WindowManager
-import android.widget.Toast
 import androidx.appcompat.app.AppCompatActivity
-import androidx.core.content.ContextCompat
 import androidx.viewpager.widget.ViewPager
 import com.finnmglas.launcher.extern.*
 import com.finnmglas.launcher.settings.SectionsPagerAdapter
 import com.google.android.material.tabs.TabLayout
 import kotlinx.android.synthetic.main.activity_settings.*
-import kotlinx.android.synthetic.main.fragment_settings_apps.*
-import kotlinx.android.synthetic.main.fragment_settings_theme.*
 
 
 class SettingsActivity : AppCompatActivity() {

app/src/main/java/com/finnmglas/launcher/TutorialActivity.kt

@@ -7,10 +7,10 @@ import android.util.TypedValue
 import android.view.*
 import androidx.appcompat.app.AppCompatActivity
 import com.finnmglas.launcher.extern.*
-import kotlinx.android.synthetic.main.activity_firststartup.*
+import kotlinx.android.synthetic.main.activity_tutorial.*
 
 
-class FirstStartupActivity : AppCompatActivity(){
+class TutorialActivity : AppCompatActivity(){
 
     /** Variables for this activity */
 
@@ -37,7 +37,7 @@ class FirstStartupActivity : AppCompatActivity(){
                 else -> R.style.finnmglasTheme
             }
         )
-        setContentView(R.layout.activity_firststartup)
+        setContentView(R.layout.activity_tutorial)
 
         if (getSavedTheme(this) == "custom") {
             activity_firststartup_app_bar.setBackgroundColor(dominantColor)

app/src/main/java/com/finnmglas/launcher/settings/SettingsFragmentMeta.kt

@@ -13,7 +13,7 @@ import androidx.fragment.app.Fragment
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
-import com.finnmglas.launcher.FirstStartupActivity
+import com.finnmglas.launcher.TutorialActivity
 import com.finnmglas.launcher.R
 import com.finnmglas.launcher.extern.*
 import kotlinx.android.synthetic.main.fragment_settings_meta.*
@@ -76,7 +76,7 @@ class SettingsFragmentMeta : Fragment() {
         }
 
         fragment_settings_meta_view_tutorial_btn.setOnClickListener {
-            startActivity(Intent(this.context, FirstStartupActivity::class.java))
+            startActivity(Intent(this.context, TutorialActivity::class.java))
         }
 
         // prompting for settings-reset confirmation

app/src/main/java/com/finnmglas/launcher/settings/SettingsPageViewModel.kt

@@ -5,7 +5,7 @@ import androidx.lifecycle.MutableLiveData
 import androidx.lifecycle.Transformations
 import androidx.lifecycle.ViewModel
 
-class PageViewModel : ViewModel() {
+class SettingsPageViewModel : ViewModel() {
 
     private val _index = MutableLiveData<Int>()
     val text: LiveData<String> = Transformations.map(_index) {

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

@@ -61,10 +61,9 @@
     <androidx.recyclerview.widget.RecyclerView
         android:id="@+id/activity_choose_apps_recycler_view"
         android:layout_width="match_parent"
-        android:layout_height="match_parent"
+        android:layout_height="0dp"
         android:layout_marginStart="16dp"
         android:layout_marginLeft="16dp"
-        android:layout_marginTop="86dp"
         android:layout_marginEnd="16dp"
         android:layout_marginRight="16dp"
         android:scrollbars="vertical"

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

@@ -8,7 +8,7 @@
     android:layout_height="match_parent"
     android:background="?attr/colorPrimary"
     android:onClick="clickAnywhere"
-    tools:context=".FirstStartupActivity">
+    tools:context=".TutorialActivity">
 
     <com.google.android.material.appbar.AppBarLayout
         android:id="@+id/activity_firststartup_app_bar"