Reload Vue template when CSS modules change in the <style> attribute

[akanix42]

When using CSS modules, a change to the class names causes a change to the $style computed property and therefore requires the template to be reloaded in order to take effect.
For example, if I create the following style, reference it in my template, and save my changes, $style.foo won't exist on the client after the hot refresh because the client won't know that it needs to reload the entire compiled JS instead of just reloading the render function.

<style module>
.foo {
 color: red;
}
</style>

<template>
<div :class="$style.foo"></div>
</template>

This PR adds cache-checking for the CSS modules output.

[Akryum]

Big thanks for your PR, as usual! Could you please test your changes against the 0.9.0 release before we could merge it?

[akanix42]

Will do. :)

[akanix42]

We've been using this with 0.9.0 no errors, but there's been some weird issues with the styles not always reloading after we make changes, so I'm planning to review this soon in case it's related.

[Akryum]

Let me know when this is ready to be merged. 😄

[Akryum]

Any news on this? 😄