feat: Add searching & fullscreen mode to screenshot viewer (#627)

* Optimized search screenshots by metadata

* feat: Screenshot metadata search bar

* fix: Reset search when selecting a file manually

* refactor: Re-do the whole search thing. Add number of results to dialog when searching

* fix: Add check & error for null metadata

* fix: Add sourceFile to error obj on return

* fix: Fix screenshot file dialog not sending path back to JS

* fix: Stop lfs parsing from dying if a value doesn't exist

* fix: Fix and optimize FileStream reading of metadata for searches

* fix: Reset search data and revert to normal when user clears out search box

* refactor: Remove/optimize some old screenshot helper stuff

- Use FileStream in ReadPNGResolution
- Limit the FindChunkIndex search range used when writing metadata
- Remove old ReadPNGDescription, just use filestream version now

* fix: Reset metadata search state if a file is added manually

* feat: Move viewer popover dialog to the fullscreen image viewer

* refactor: Change how parsing errors are handled... again

* refactor: Let the search carousel loop around

* fix: Re-do legacy parsing /wo JObject. Fix legacy instance ids/pos.

Also adds further docs to the legacy parsing for the various formats

* feat: Add persistent metadata cache for search

* Clean up

* fix: Fix viewer dying

sourceFile wasn't being included for vrcx pics

* refactor: Cache the state of files with no metadata

This is so we're not constantly re-processing these files with no metadata on every first search after a restart; These files won't magically gain metadata and this could cause a lot of hitching for someone that had potentially thousands of screenshots before using VRCX.

* Screenshot viewer loading

---------

Co-authored-by: Nekromateion <43814053+Nekromateion@users.noreply.github.com>
Co-authored-by: Natsumi <cmcooper123@hotmail.com>

VRCX.csproj

@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
   <PropertyGroup>
@@ -87,6 +87,8 @@
     <Compile Include="CefCustomDownloadHandler.cs" />
     <Compile Include="CefCustomDragHandler.cs" />
     <Compile Include="CefCustomMenuHandler.cs" />
+    <Compile Include="ScreenshotMetadata.cs" />
+    <Compile Include="ScreenshotMetadataDatabase.cs" />
     <Compile Include="WorldDatabase.cs" />
     <Compile Include="ImageCache.cs" />
     <Compile Include="IPCClient.cs" />