Language: Deprecate implicit imports and hidden globals

[wcjohnson]

As a start to ushering in a cleaner language for static analysis/merging with TypeScript, my objective is to clean up areas where there is implicit or hidden pollution of globals. This involves the following steps:

Deprecate Lightscript stdlib/Lodash implicit imports

• Non-breaking stdlib deprecation path
• { stdlib: false } is now a default option
• Those wanting old behavior can set { stdlib: true } in compiler config

Deprecate implicit global operators

• looseEq, looseNotEq, bitwise* implicit globals will be removed
• Those desiring old behavior can set { implicitGlobalOperators: true } in compiler opts
• Option removed altogether in 5.x
• Instead, import { looseEq, ... } from '@lightscript/lang' at top level
• Compiler will detect this and treat it as a virtual import, replacing with compiled code
• A nonce module will be published to npm as @lightscript/lang to aid with static analysis

Deprecate implicit lightscript runtime imports

• @lightscript/runtime will no longer be implicitly imported
• Those desiring old behavior can set { implicitRuntime: true } in compiler opts
• Option removed altogether in 5.x
• When the compiler encounters a construct requiring the runtime, it will check for import runtime from '@lightscript/runtime' at top level
• If the runtime is not imported, an error is thrown
• A lint rule will be added to check for constructs that require the runtime