refactor: add typing's for typescript

[philstenning]

The typescript compiler in vs-code was giving lots of red squiggly lines so have added the needed types and type definition files to help when editing in the future.

added app/javascript/src/globals.d.ts so now you get intelligence when typing

There were also a few methods called that do not exist, I did check the three docs and also initially wrapped them in a try/catch block and they threw, so removed them also.

bbox.dispose()
centre.dispose()
bsphere.dispose()

In app/javascript/src/model_edit.ts

removed the maxitem= null as this is the default, and ts requires a number if a value is supplied

In package.json added a script option to run the ts-standard as used in husky so you can now do a: yarn run lint:ts

Would it be useful to run a tslint and prettier and or add a config to the project to keep things tidy and consistent? I'm not a ruby guy so not shure how it does things just yet.

[Floppy]

Thanks! I'm a huge fan of linters, so yeah, it would be great to run ts-standard over it all, if I've not already set that up (though I thought I had).