* Avoid sending "0 new commits" webhook

Signed-off-by: Till Faelligen <tfaelligen@gmail.com>

* Revert "Avoid sending "0 new commits" webhook"

This reverts commit 1f47ccfacd.

* Move commit count check to more central place

* Make tests pass

* Update modules/webhook/webhook.go

Co-authored-by: Lauris BH <lauris@nix.lv>

Co-authored-by: Lauris BH <lauris@nix.lv>
Co-authored-by: zeripath <art27@cantab.net>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>

* Move more webhook codes from models to webhook module

* Move webhook to a standalone package under modules

* fix test

* fix comments