respect inline source maps in TypeScript files

[johndeighan]

I use civet to generate my TypeScript files. There are other similar languages (i.e. that produce TypeScript, but are easier to understand and work in). But when I run "deno check somefile.ts", the errors are being reported as being some line number in the somefile.ts file instead of a location in the original source file, even though all of my *.ts files include inline source maps. That forces me to find the location in the *.ts file, figure out which function the code is in, then find the corresponding location in the original source file, in order to fix the problem.