Giving user option to generate ICS / add events / delete events within gyft.py

[ashwinpra]

With reference to #91

• Modularised the whole code and made it cleaner
• Now, instead of user having to execute generate_ics.py separately, the generate_ICS() function is executed directly in gyft.py based on user input
• Earlier, the --input (name of input .txt file) and --output(name of output .ics file) arguments taken by generate_ics.py is now taken by gyft.py directly
• Here is the current workflow:
  • Checks if input .txt file exists. If yes, ask user whether they want to overwrite it
  • If it doesn't exist, or user asks to overwrite, timetable is fetched and saved to the .txt file
  • Asks user whether they want to generate .ics file. If yes, generate it using generate_ICS()

If these changes are fine, I will update the README correspondingly, and also work on adding the functionalities of add_events.py and delete_events.py as well.

[ashwinpra]

Now for the biggest task - updating the docs (=____=)

[proffapt]

Now for the biggest task - updating the docs (=____=)

Ig lets do it in separate PR after this, it already has a an issue #93
You can implement those points in multiple PRs if need (talking about video, can do that later)

[proffapt]

Jai ho ashwin baba ki :orz: