fix(ns-bundle): use remove/add platform instead of clean-app

[sis0k0]

Leaving old build files in the platform folders caused several issues.

fixes #75, fixes #112

[vchimev]

run ci

[sis0k0]

run ci

[ishitatsuyuki]

Is there any plans to make this unnecessary? Writing the platform again and again hurts my SSD (and it takes time for sure).

[sis0k0]

Yep, we'll be looking for a workaround. Just wondering, how often are you bundling your project with webpack? We assume, people do this only for release builds (since it has no livereload yet), but I'm curious if you're using it for development.

[ishitatsuyuki]

Two cases:

1. You don't want to destroy your SSD while investigating webpack config errors.
2. Cache is ruined when doing both test and release build in CI.

Also, if I'm correct, this doesn't clean the things up after bundling right? It's probably causing a gradlew binding error then, starting from 3.0.

[ishitatsuyuki]

I have opened #145 to track this case. Let's discuss there.