Multi mode search system

[YoyloNerd]

Adding a dropdown to select between 2 searching modes

• And (item contains all tags)
• Or (item contains a tag)

[CyanVoxel]

Looks pretty good! Just a few comments and nitpicks and this should be good to go:

1. SEARCH_MODES would be better off inside of enums.py for better readability instead of having situations such as search_mode: int = 0 where it isn't clear to other people what's happening:

class SearchMode(int, enum.Enum):
    """Operational modes for item searching."""
    
    AND = 0
    OR = 1

2. Remove leftover print statements from library.py
3. Use "Title Case" for the combo box options

Thank you again for all your work on this!

[CyanVoxel]

Looks awesome! Thank you again for all your work on this!