Most tools only operate on certain file types, and all tools had to

implement their own logic for this. This meant that some were checking

if a file ends with a pattern, some were splitting file extensions, and

not all could agree on case-sensitive vs. case-insensitive matching.
In an attempt to standardize this, a new

BaseTool.get_can_handle_file() method has been added, which defaults

to checking a new BaseTool.file_patterns for glob patterns.
Comparison is case-insensitive. This is the right default behavior, but

subclasses can always override get_can_handle_file() to perform their

own logic, or continue just checking directly in handle_file() as they

have in the past.
We can extend this further down the road, if needed, to support other

entries in file_patterns, such as compiled regex objects, to extend

capabilities in a consistent way.
As of this change, no tool uses this new functionality, but changes will

be made to add support over time.

Unit tests passed.
Did some light testing with other in-progress tool work.