[Feature] Using filled rectangular boxes as markers

[Udayraj123]

Describe the bug
When using filled rectangular boxes as markers, omr_marker is getting detected incorrectly
Discord discussion: https://discord.com/channels/590134763784896514/1067501671627890731/1067971688169492480

To Reproduce
Steps to reproduce the behavior:

1. Use any sample that contains rectangular filled markers
2. Run omrchecker on that image
3. See that the markers are not getting detected correctly.

Expected behavior
Markers should get matched as usual for other cases.

Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: [MacOS]
• Python version: 3+
• OpenCV version: 4+

Additional context

The template matching result is supposed to be a black image with white spots. But it is coming as a full white image.

Steps breakdown:

[Udayraj123]

There's a new plugin in development for solving this type of OMRs along with the ones having an timeline strip.

[Udayraj123]

Converting this issue into a feature.
Development tracked in branch: feature/crop-on-timeline --> feature/auto-align-template which tries to implement a generalised version