[perl6] Explain `orelse` operator, add more information about exceptions, add an Iterables section... (#2505)

* More clear names for the module and variables demonstrating declarators (our) for sub's and a few more details in comments

* $! is only set when we use "try" not when we disarm an exception with or/orelse thanks to ZoffixZnet for the information here provided here: https://rt.perl.org/Ticket/Display.html?id=129923

* Fix the example from the last commit. Some changes in the try/catch paragraph

* Change it so the vim modeline doesn't show up in the final html file(not even as a comment)

* Minor grammar fix

* Add more information about the .exception method and explain how orelse differs from the or operator

* Add link to the Perl6 docs and explain that while the Perl 6 advent calander is a great reference it may be a little older (Posts stopped in Dec of 2015).  Also make the columns fit better to 80 characters

* Fix in issue with a few of the regex examples, where Perl 6 would warn because the spacing was ambiguous. Explain how you must use two spaces between strings so spacing isn't ambiguous or use the :s adverb to make whitespace meaningful explicitly.  Also explain 'm' and using delimiters other than / /

* Improve the readability of the phasers introduction

* Fix the remaining regex that will warn because of ambiguous spacing

* Add an example for ‘quietly’ since it has been implemented now

* Update link for precedence order to point to current documentation

* Add a section on iterables and show examples for using the lazy method

* Some corrections

* Change downloaded filename to .p6 instead of .pl

* Show vertical line for 80 column width in vim modeline

* Update the exceptions section to vendethiel's suggestions

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