Refactor: Add strict types declaration to all Framework PHP source files

[caendesilva]

No description provided.

[caendesilva]

This requires a lot of refactors, which is good as it fixes undiscovered type bugs.

Wondering which looks prettiest

return $this->__toString();

return (string) $this;

[codecov]

Codecov Report

Merging #586 (c05087b) into master (fe113db) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master     #586   +/-   ##
=========================================
  Coverage     99.95%   99.95%           
- Complexity      974      975    +1     
=========================================
  Files           114      114           
  Lines          2409     2411    +2     
=========================================
+ Hits           2408     2410    +2     
  Misses            1        1           

Impacted Files	Coverage Δ
...ckages/framework/src/Actions/BladeMatterParser.php	100.00% <ø> (ø)
.../Constructors/FindsContentLengthForImageObject.php	100.00% <ø> (ø)
...ctions/Constructors/FindsNavigationDataForPage.php	97.95% <ø> (ø)
...ork/src/Actions/Constructors/FindsTitleForPage.php	100.00% <ø> (ø)
...amework/src/Actions/ConvertsArrayToFrontMatter.php	100.00% <ø> (ø)
...amework/src/Actions/CreatesNewMarkdownPostFile.php	100.00% <ø> (ø)
...framework/src/Actions/CreatesNewPageSourceFile.php	100.00% <ø> (ø)
...rk/src/Actions/GeneratesSidebarTableOfContents.php	100.00% <ø> (ø)
...ckages/framework/src/Actions/MarkdownConverter.php	100.00% <ø> (ø)
...kages/framework/src/Actions/MarkdownFileParser.php	100.00% <ø> (ø)
... and 104 more

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