Improved Menu User Input

• All menus now read Key Press instead of a string input - Enter is no longer required. This makes Timeoff Management easier to use.
• This also captures Ctrl-C, which is now treated as a Exit call to the menu, instead of a SIGTERM to kill the app entirely. This helps with ensuring logout is executed.

Minor bug fixes and menu update

Minor update:

• Timeoff Management Menu now uses characters as options instead of unintuitive numbers.
• Fixed an issue where a week with multiple timeoff requests will overwrite each other's descriptions.

Proof of Concept Release

Pre-release to show how a small utility can help us book our Friday off easier on a personal level.

• Does NOT use tokens; logins with username and password, maintaining session with cookies instead. Our account tokens don't appear to work.
• Book Friday offs on a per month basis, saving a lot of clicking on the UI.
• Visually see your time offs on a calendar.