[C++] Multiple define directives option?

[EntityPlantt]

Description

Currently CPH has only one define directive to check before running: ONLINE_JUDGE

I suggest there would be more define directives, something like a list where you can add/remove/edit entries and check specific ones. The entries (along with the checkbox values) should be saved to the problem file in ./.cph.
Default values would be:

🗸 CPH
🗸 DEBUG
  ONLINE_JUDGE

I opened this issue, as the contribution guide says, to discuss the idea with you (@agrawal-d) and the contribuitors, to see if it is OK. It's probably not a problem for me to open a PR and push this update.

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