Improvements to JavaScript analysis

General improvements

Modelling of taint flow through array operations has been improved. This may give additional results for the security queries.
Support for popular libraries has been improved. Consequently, queries may produce more results on code bases that use the following features:
- file system access, for example through fs-extra or globby

Query	Tags	Purpose
Enabling Node.js integration for Electron web content renderers (`js/enabling-electron-renderer-node-integration`)	security, frameworks/electron, external/cwe/cwe-094	Highlights Electron web content renderer preferences with Node.js integration enabled, indicating a violation of CWE-94. Results are not shown on LGTM by default.
Stored cross-site scripting (`js/stored-xss`)	security, external/cwe/cwe-079, external/cwe/cwe-116	Highlights uncontrolled stored values flowing into HTML content, indicating a violation of CWE-079. Results shown on LGTM by default.

Query	Expected impact	Change
Regular expression injection	Fewer false-positive results	This rule now identifies calls to `String.prototype.search` with more precision.
Unbound event handler receiver	Fewer false-positive results	This rule now recognizes additional ways class methods can be bound.
Remote property injection	Fewer results	The precision of this rule has been revised to "medium". Results are no longer shown on LGTM by default.
Missing CSRF middleware	Fewer false-positive results	This rule now recognizes additional CSRF protection middlewares.