Add several EMS file formats.

src/main/decoder/decode-stl.interface.ts

@@ -0,0 +1,20 @@
+export interface DecodedStl {
+  ttl_type?: string;
+  ttl_typecd?: string;
+  t_amt?: number;
+  t_hrs?: number;
+  t_addlbr?: number;
+  t_discamt?: number;
+  t_mkupamt?: number;
+  t_gdiscamt?: number;
+  tax_amt?: number;
+  nt_amt?: number;
+  nt_hrs?: number;
+  nt_addlbr?: number;
+  nt_disc?: number;
+  nt_mkup?: number;
+  nt_gdis?: number;
+  ttl_typamt?: number;
+  ttl_hrs?: number;
+  ttl_amt?: number;
+}