Adding ServiceManager typescript definitions; and fixing typos and potential bugs.

[pomgui]

This PR contains the following changes:

index.js

Line(s)	Description
1381,1575	params parameter is optional, but if it wasn't sent then custom parameter value was being lost.
1798	added name limbotrans for the property that was being populated by _processQuery
2180-2184	Simplifying expressions: (x != null ? x : null) <==> x
2218-2220	The if expressions weren't considering undefined nor other types (strings, objects, Dates, etc.), better using ===.
2270	Adding constants to be used as parameters of Shutdown (specially useful in typescript)
2365,2386	options is not defined, so these lines would throw an exception. Using null they will get their default values).
2586,2588,2601	infos.length will never be defined as infos is meant to be an object with the required properties, so better using another validation for empty object.
2702	removing optread as it was never used
2780	Removing callback parameter as pool wasn't using it at all. The example in the README.md wasn't sending it as well.
3610	Removing unreacheable code. The line 3593 already took care of it.
4320	Removing redundant if. No matter if it's true or false, the same code will be executed

index.d.ts

Line(s)	Description
7	Fixed typo
21-25	Changing return type as intended in the js code.
26-27	Added methods to Database as intended in the js code.
48,58	Added new attach to return a ServiceManager instance
59	Fixed typo
62	Removed callback parameter from pool.
63-240	Added ServiceManager definitions