Merge pull request javascript-obfuscator#599 from javascript-obfuscat…

…or/bigint-support

Bigint support

Merge pull request javascript-obfuscator#596 from javascript-obfuscat…

…or/issue-590

Normalize of invalid source code type argument

Merge pull request javascript-obfuscator#594 from javascript-obfuscat…

…or/issue-593

Fixed wrong external options merge

Merge pull request javascript-obfuscator#583 from javascript-obfuscat…

…or/multiple-sources-identifiers-prefix

Fixed identifiers prefix generation for `obfuscateMultiple` method

Merge pull request javascript-obfuscator#582 from javascript-obfuscat…

…or/commander-version-update

Commander version update

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