Aimmy 2.4.0 Update

Changelog:

Added new fancy startup window / animation
Fixed forgotten version # update in CheckForUpdates func
Version number for check now pulls from UI so I can hopefully avoid that again
Deleted old Welcome.xaml files (was originally going to be used for key system which won't happen in Aimmy V2 ever)
Fixed UpdateManager not handling newer versions (would update you back to older version before fix)
Updated gradient effect on menu buttons (looks nicer)
Changed aim settings button icon from Guy Walking to Target (E726->E1D2)
Added new ThemeManager to apply theme to UI elements
Added theme colors to the UI (tags/theme tags to mark items)
Added color wheel element for theme color selection
Theme color now applies to new startup animation
Added focus display selector (pick displays without having to relaunch Aimmy on the correct display - supports up to 4 different displays)
Updated notice bar style, fixed it's disappear timing, and updated it to use theme
Fixed screen shots being taken even while "Collect Data While Playing" was turned off
Adjusted FOV/Detected windows to support display selector
Updated ConfigSaver to handle new themes
Updated AntiRecoil to handle new themes

Massively reduced startup lag
Split each XAML section off into it's own XAML file to help organize the source better
Each XAML section's CS code was split off into it's own CS as well from the Main.cs
Each section now lazy loads to help load times and speed
Managers now lazy load to help with performance and startup
Cleaned up and optimized each sections CS code after moving it into it's own file
Async fix to prevent UI freezing when grabbing PC details for about page

I'm sure there is more that I missed.. (There were +6940 and
-1848 lines of code - 49 files changed)