Merge pull request javascript-obfuscator#581 from javascript-obfuscat…

…or/multiple-sources-obfuscation

New `obfuscateMultiple` method

Version update

Merge pull request javascript-obfuscator#578 from javascript-obfuscat…

…or/comments-at-the-top

 Fixed javascript-obfuscator#575

Merge pull request javascript-obfuscator#572 from javascript-obfuscat…

…or/issue-569

 Fixed javascript-obfuscator#569

Merge pull request javascript-obfuscator#570 from javascript-obfuscat…

…or/global-identifiers-prefixes

Added prefixes to the generated global identifiers of the added code

Merge pull request javascript-obfuscator#564 from javascript-obfuscat…

…or/issue-563

Changed the way to rename variable identifiers and references

Merge pull request javascript-obfuscator#562 from javascript-obfuscat…

…or/issue-550

Fixed wrong scope of preserved identifiers of shorthand object pattern property

Merge pull request javascript-obfuscator#552 from javascript-obfuscat…

…or/variable-preserve-improvements

Variables preserve transformer improvements

Merge pull request javascript-obfuscator#547 from javascript-obfuscat…

…or/exponentiation-operator-fix

Fixed support of exponentiation operator

Merge pull request javascript-obfuscator#544 from javascript-obfuscat…

…or/issue-542

Fixed wrong rename of object pattern identifiers