Cleanup Logic and Add Fenced Code Block Empty Lines

[pjkaufman]

Relates to #32

Did some code cleanup with regards to values that come from the window making them available for Typescript to validate information around. Also added a new rule for fenced code blocks getting empty lines around them. Replaced custom normalize path with normalize path from obsidian.

Changes Made:

• Added a window interface to allow for Typescript to recognize moment and a command to help with not needing to do any casts (I am working on the casts to any and removing them)
• Replaced normalize path function with the one from Obsidian to cut down on code creation since we can use the provided API
• Added a new rule for adding an empty line around fenced code blocks