Added truncation line enabled property

[ivanbruel]

I needed a way to provide the behavior as seen below:

In order to accomplish this, aside from setting the attributedTruncationToken to a custom token Read All, I added a property to TTTAttributedLabel to be able to set a truncation token to occupy the whole last line. The parameter added is truncationLineEnabled.

[codecov-io]

Current coverage is 75.75% (diff: 60.00%)

Merging #704 into master will increase coverage by 5.52%

@@             master       #704   diff @@
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  Files             2          2          
  Lines           944        961    +17   
  Methods         112        141    +29   
  Messages          0          0          
  Branches        225        136    -89   
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+ Hits            663        728    +65   
- Misses          128        135     +7   
+ Partials        153         98    -55   

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[ivanbruel]

Adding a range for the Link on a given attributedTruncationString was having issues with hitboxes because the underlying text is not monospaced, as such, it lead to wrong link click detection