v0.7.0 - egui update and QoL changes

🚨 Breaking Changes

• Updated egui from version 0.28.0 to version 0.29.1 #155 and #157 (thanks @crumblingstatue!)

🔧 Changes

• Path edit is now selected as the desired file if the path entered is an existing file and the dialog is in DialogMode::SelectFile mode #151
• Implemented Debug trait for FileDialog #152
• Added several lints and general code cleanup #153 (thanks @bircni!)