Migrating ListView to CollectionView

[cscharf]

Builds but crashes when displaying the ciphers page.

• Refactored all ListView to CollectionView, including AutofillCiphers, Ciphers and Groupings pages that used that type, as well as Folders, Settings and Password History
• Refactored CipherViewCell to no longer be a ViewCell but instead a Grid (based on feedback); removed "CellView" from everywhere
• Removed Android renderers for the CipherViewCell and Extended list views
• Updated style definitions to point to CollectionView
• Added separator style as BoxView on necessary collections since CollectionView doesn't support the ListView concept of Separator
• Added Icon Renderer to utilities instead of coding that directly into cipher view control

Open Issues

• iOS rendering of Grouped list items is wonky at best, sometimes accordion style collapse of white-space and sometimes not, sometimes different throughout the list, etc.
• Android - Context menu doesn't work, null reference exception
• iOS + Android - Padding of items in CollectionView when viewing vault is non-existent and squishes them all together (Grouped view appears slightly differently when there are groups)

[cscharf]

Issue with consistent rendering will need some debugging, but otherwise works on iOS:

[cscharf]

Android won't even render/display the cipher items in the list, although the CollectionView itself on the Groupings page looks great (unlike iOS)

[mpbw2]

VSwin and VSmac seem to argue endlessly about this value. We've established VSwin as our gold standard so this is just a reminder to revert this before finalizing the PR. (fwiw Rider is polite enough to leave it alone)

[cscharf]

Ah, that is odd considering the .sln file actually has the App project listed with UUID, EE44C6A1-2A85-45FE-8D9B-BF1D5F88809C, which VSmac seems to be picking up and correcting in the project reference in the Android project. Not sure where VSwin is getting the UUID, 9F1742A7-7D03-4BB3-8FCD-41BC3002B00A since it exists nowhere in the .sln file or the App.csproj file. very bizarre; but I'll undo it before PR-time.

[cscharf]

Latest updates, iOS display issues and inconsistency in padding still broken/not working. Android looks better, however cipher list does not respect padding and context/more menu is broken (null ref exception).

[cscharf]

System.NullReferenceException: Object reference not set to an instance of an object.
  at Bit.App.Utilities.AppHelpers.CipherListOptions (Xamarin.Forms.ContentPage page, Bit.Core.Models.View.CipherView cipher) [0x000c6] in /Users/chadscharf/source/bitwarden/vs/mobile/src/App/Utilities/AppHelpers.cs:23
  at Bit.App.Pages.GroupingsPageViewModel.CipherOptionsAsync (Bit.Core.Models.View.CipherView cipher) [0x0004b] in /Users/chadscharf/source/bitwarden/vs/mobile/src/App/Pages/Vault/GroupingsPage/GroupingsPageViewModel.cs:496
  at System.Runtime.CompilerServices.AsyncMethodBuilderCore+<>c.<ThrowAsync>b__7_0 (System.Object state) [0x00000] in /Users/builder/jenkins/workspace/archive-mono/2020-02/android/release/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1021
  at Android.App.SyncContext+<>c__DisplayClass2_0.<Post>b__0 () [0x00000] in <eaa205f580954a64824b74a79fa87c62>:0
  at Java.Lang.Thread+RunnableImplementor.Run () [0x00008] in <eaa205f580954a64824b74a79fa87c62>:0
  at Java.Lang.IRunnableInvoker.n_Run (System.IntPtr jnienv, System.IntPtr native__this) [0x00008] in <eaa205f580954a64824b74a79fa87c62>:0
  at at (wrapper dynamic-method) Android.Runtime.DynamicMethodNameCounter.1(intptr,intptr)

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