HUGE revamp

Changes

• optional fields are no longer automatically filled in
• some properties are now laid out differently in the ui
• most pak errors are now communicated through the notification system

• multiple actors can now be selected at a time by using shift + click

• the entire program has been ported to a more stable backend (miniquad -> wgpu)

with this there has been a lot of changes:

• the config directory has been moved from %localappdata% to %appdata%
• window size and position is now stored
• maps can now be opened by dragging their file onto the application window

• meshes are actually rendered properly now (main reason for move)

• mesh rendering has been reverted back to wireframe for now...