Text component content not retrieved properly when using custom RTE

Version: 0.16.12

Are you able to reproduce the bug from the demo ?

[ ] Yes [x] No (it does not include a custom RTE)

What is the expected behavior ?

When using a custom RTE, the generated / exported code should correspond to the RTE's generated code

What is the current behavior ?

The generated code corresponds to the text component canvas element's innerHTML.

If we take CKEditor as an example: creating an empty anchor (as shown in screenshot 1) results in GJS' generated code containing the anchor flag's <img> element (cf screenshot 2), whereas CKEditor generates it properly (cf screenshot 3).

Proposed solution:

• The ComponentTextView.getContent method should look for this.activeRte instead of this.rte.activeRte, which I don't think ever exists given the actual affectation

• This would also imply exposing the appropriate rte.getContent method from the CKEditor plugin (which I think should reference CKE's getData method)

Does this look good to you ? As always, I'd be happy to open both PRs to fix this :) !

Are you able to attach screenshots, screencasts or a live demo ?

[x] Yes (attach)

Screenshot 1 (example canvas):

<img width="200" alt="Screenshot 2020-07-24 at 4 05 06 PM" src="https://user-images.githubusercontent.com/9916749/88408361-bf547c00-cdd3-11ea-9bfa-df6dcb3b3fbb.png">

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Screenshot 2 (GJS' generated code):

<img width="408" alt="Screenshot 2020-07-24 at 4 05 17 PM" src="https://user-images.githubusercontent.com/9916749/88408374-c24f6c80-cdd3-11ea-9682-fa80454fabf9.png">

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Screenshot 3 (CKEditor's generated code):

<img width="818" alt="Screenshot 2020-07-24 at 5 22 57 PM" src="https://user-images.githubusercontent.com/9916749/88408382-c4b1c680-cdd3-11ea-8605-33e0ed9e6a26.png">

[ ] No