Use importjs

[konsumlamm]

This PR changes uses of importcpp to importjs where it doesn't make any problems.

I looked at all files with "js" in the path name, those that I didn't change are:

• js/dom.nim
• js/dom_extensions.nim
• js/jsconsole.nim
• js/jscore.nim
• system/jssys.nim

Using importjs there gives `importjs` for routines requires a pattern errors, since apparently importjs doesn't behave the same as importc and importcpp. Should I open an issue for this or just add patterns for the imports (in a future PR)?

[dom96]

Nice! LGTM

[timotheecour]

see also timotheecour#662

[timotheecour]

LGTM. the reason this now works is that docs for nim js modules are now built with the new -b:js flag

[timotheecour]

Using importjs there gives importjs for routines requires a pattern errors, since apparently importjs doesn't behave the same as importc and importcpp. Should I open an issue for this or just add patterns for the imports (in a future PR)?

it should be discussed in nim-lang/RFCs#315, please add a note there if this use case isn't covered already