Add more rules to weaken linter in dev mode

[JakobMiksch]

This pull request weakens more eslint rules when using dev-mode:

• space-before-blocks
• space-before-function-paren
• object-curly-spacing

This helps to be more productive while making prototypes in Wegue. But of course, this does not affect the proper checking of rules when running npm run build.

[chrismayer]

Thanks for this @JakobMiksch .

OK for me.

[chrismayer]

Anyone else vetoing? Otherwise I am going to merge.

[fschmenger]

This is appreciated from my side.
What do you guys think about just using syntax checking at all for dev-mode, e.g. by using esvalidate or some eslint recommended profile (not sure if the latter does exactly that)?

[JakobMiksch]

@fschmenger your suggestions sounds reasonable as well