Blockquotes: Nuking Zero Width Spaces

[jleandroperez]

Details:

In this PR we're nuking the Zero Width Character from the Blockquote Formatter's innerworking.

Thanks in advance sir!
Needs Review: @diegoreymendez

Closes #422

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Scenario A: Missing Blockquote after Backspace

1. Launch the empty editor
2. Toggle the Blockquote format
3. Enter any random text
4. Hit backspace

Verify that the blockquote style is still present.

Scenario B: Nuking Blockquote after Backspace

1. Launch the empty editor
2. Toggle the Blockquote format
3. Enter any random text
4. Select the end of the document
5. Hit backspace

Verify that the Blockquote gets effectively removed.

Scenario C: Newline after blockquote

1. Launch the empty editor
2. Toggle the Blockquote format

Verify that a newline is inserted below the blockquote.

Scenario D: Nuking bottom \n and adding newlines

1. Launch the empty editor
2. Toggle the Blockquote format
3. Enter any random text
4. Select the end of the document
5. Hit backspace
6. Hit \n and enter any random text

Verify that the new Blockquote line gets it's proper style, even when the bottom \n was initially nuked.

Scenario E: Typing Attributes below Blockquote

1. Launch the empty editor
2. Toggle the Blockquote format
3. Press the arrow down

Verify that the blockquote gets removed from the typing attributes (and that the text indentation looks normal).

Scenario F: Autoremoval after hitting return on newline

1. Launch the empty editor
2. Toggle the Blockquote format
3. Hit return

Verify that the blockquote gets removed.

[diegoreymendez]

Ship it!

[jleandroperez]

Wooooooo

Thanks Diego!!