Rename main.cs and use Path.GetFileName to make the project more cross platform and optimize updating of the UI

[BramOtte]

This is PR aims to make the project buildable and runnable on linux, it does this by:

• renaming main.cs to have proper casing
• using Path.GetFileName instead of looking for a \
• using python3 instead python on non-windows platforms.

it also includes some other tweaks namely:

• adding .godot to the .gitignore since godot will generate that anyway
• make UpdateVisualizers() update the visualizers less often to make it more performant on high clock speeds. I could split these other changes to their own PR if that makes more sense.

[AdoHTQ]

This branch does way more than what the PR says. Could you list those?

[AdoHTQ]

Everything in this PR has now been implemented in separate commits.