Cleaning up the repository

[Nirmal4G]

It's hard to read and understand the repo because of all the redundant files. It is also difficult to create PRs cleanly without introducing some sort of formatting change.
The following changes (although not exhaustive) would improve the contribution experience a little bit better.

• Remove un-used, un-necessary and duplicate files
• Clean-up trailing white-spaces and new-lines
• Use Unicode charset without the BOM
• Remove redundant xml meta-tag
• Fix indentation on switch-case

I hope, these changes, along with the upcoming clean-up #3896 and refactoring #3898 would definitely make this repo better for everyone.

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