Account feature

[lucashuy]

Sorry about the large pull request.

This request closes #2.

This request will resolve the following user stories:

• Closes Profile Avatar #40
• Closes Edit profile info #57
• Closes User profile site Achievements #54

This request will additionally close the following dev tasks:

• Closes Backend for profile Avatar #38
• Closes Frontend UI to upload profile picture #39
• Closes Edit profile UI #56
• Closes Handle requests to edit profile #55
• Closes Create frontend UI to edit posts #21
• Closes Track site achievements #50
• Closes Fetch achievements #51
• Closes Display acchievements #52
• Closes Achievement Icons #53

This pull request will contain the tests for previously done tasks for feature #2.

The frontend now contains a Profile. The profile has the password, avatar and personal details settings. All profile related React components are prefixed by Profile. Additionally, helper components have been created to make reuse of them easier (Button, Input, RoundedBox, StatusMessage).

[humayraR]

Reviewed as thoroughly as I could lol. Frontend looks good enough (i don't have much experience so can't say). Put in a few comments here and there for backend.

[humayraR]

This is a huge PR, tried my best to review it thoroughly. It looks good to me.