Coding Standards: Main plugin file

* fixed indentation - swapped spaces for tabs at start of line, swapped
tabs for spaces min-line for alignment
* removed instances of `@return void` and `@access public`

@see http://make.wordpress.org/core/handbook/coding-standards/php/
Coding Standards: Abstract classes

* fixed indentation - swapped spaces for tabs at start of line, swapped
tabs for spaces min-line for alignment
* removed instances of `@return void` and `@access public`
* improved readability

@see http://make.wordpress.org/core/handbook/coding-standards/php/
Coding Standards: Less files

* fixed indentation - swapped spaces for tabs at start of line, swapped
tabs for spaces min-line for alignment
Coding Standards: Admin JS

Fixed spacing as per
http://make.wordpress.org/core/handbook/coding-standards/javascript/
Coding Standards: Admin - Importers

* fixed indentation - swapped spaces for tabs at start of line, swapped
tabs for spaces min-line for alignment
* removed instances of `@return void` and `@access public`
* improved readability

@see http://make.wordpress.org/core/handbook/coding-standards/php/
Coding Standards: Admin - Meta boxes

* fixed indentation - swapped spaces for tabs at start of line, swapped
tabs for spaces min-line for alignment
* removed instances of `@return void` and `@access public`
* improved readability

@see http://make.wordpress.org/core/handbook/coding-standards/php/
Coding Standards: Admin - Reports

* fixed indentation - swapped spaces for tabs at start of line, swapped
tabs for spaces min-line for alignment
* removed instances of `@return void` and `@access public`
* improved readability

@see http://make.wordpress.org/core/handbook/coding-standards/php/
Coding Standards: Admin - Settings

* fixed indentation - swapped spaces for tabs at start of line, swapped
tabs for spaces min-line for alignment
* removed instances of `@return void` and `@access public`
* improved readability

@see http://make.wordpress.org/core/handbook/coding-standards/php/
Merge pull request #6157 from tamarazuk/coding-standards

Coding standards Part 1