feat: Replaced pragma with include guards

[EmperorYP7]

Signed-off-by: Yash Pandey (YP) yash.btech.cs19@iiitranchi.ac.in

This PR fixes #80

Description
Although #pragma once is less prone to errors and is supported by a wide range of compliers, they produce some warnings when compiling with Clang or GCC on MacOS and Linux. I carefully replaced #pragma once and implemented include guards in each cpp file. Here is a glimpse of what it looks like for a file, say foo.cpp:

// Prelude/License

#include "pch.h"
 
#ifndef FOO_CPP
#define FOO_CPP

// The contents of the file

#endif // FOO_CPP

Note on compilation

There were no warnings generated on build for all configurations after implementing this.

Tested on

OS: Darwin arm64 20.3.0
Compiler: Clang 12.0.0
Effective build time: ~12 seconds

[divy9881]

Rebase or soft-reset your commits, and make your commit message semantic to pass the semantic-PR CI.
Other-wise I think the PR is fine and can be merged.

[EmperorYP7]

I think the CI is happy now. Thanks!

[divy9881]

LGTM

[github-actions]

🎉 This PR is included in version 1.11.6 🎉

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