Add flipping flags parsing/clearing to tile objects

[dcronqvist]

Description

As described in #43, Flipping Flags are not properly parsed and cleared from global tile IDs for tile objects. This would mean that a user would have to perform their own clearing of flipping flags to get a useful GID. As this is handled properly when parsing other tile data, it should be performed here too to not cause confusion.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

Checklist

• Tests have been added/updated to cover new functionality.
• Documentation has been updated for all new changes (e.g., usage examples, API documentation).