Adding WSL Support + Refactor

[vezaynk]

• Implements #37
• Refactor runCommand (Use exec instead of streaming output with spawn)
• Refactor if-else hell using switches
• Run prettier against code-base (Formatter, will add CI to enforce format checks to this repository in a later PR)
• Add WSL Support #35, #43

Accessing clipboard from WSL is done the exact same way as in windows, the only thing to be careful with are that the paths must be converted to window's format.

Tests:

I'm not sure how to setup automated cross-platform tests (especially for WSL). I tested it for WSL, I'll need help testing it for other platforms.

WSL:

• [x] Paste HTML
• [x] Paste Image
• [x] Paste Text
• [x] Download image

Windows 10:

• [ ] Paste HTML
• [ ] Paste Image
• [ ] Paste Text
• [ ] Download image

Windows 32:

• [ ] Paste HTML
• [ ] Paste Image
• [ ] Paste Text
• [ ] Download image

Darwin (Seems to be missing scripts across the board, no way for it to work):

• [ ] Paste HTML
• [ ] Paste Image
• [ ] Paste Text
• [ ] Download image

[vezaynk]

@telesoho Ready for review. I need some help testing it, but I'm fairly confident that everything should just work.

[telesoho]

@knyzorg Great job! Thank you. I'm also not sure how to setup cross-platform tests too. Anyway, I published it so that other people can help.