Add Additional Core Update Functions

[benevolent0377]

Additional Functions to the Ucore.py file

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Problem 1:

• When the core files are being updated, if a core file has been removed from the remote repository, it will be ignored by the updater, instead of being removed from the local system.

Solution:

• Create a function to remove all files that don't show up in the files/ directory of the git repo.

Problem 2:

• The program will quit out if the core updater has been modified, saying the same prompt when the core files are updated. This is confusing and results in the user having to run install.py twice to ensure the core updater has updated, and the core files have been updated.

Solution:

• Make a special printout requesting the user to re-run the install.py script when the core updater gets modified, ensuring the core files are updated, as the user will be aware that they must re-run the installation script

Solution 2:

• make the modification of the core updater not quit out the whole process, but instead recall the file, making it unnecessary for the user to run the install.py script twice.