Show semantic errors for TypeScript file.

TypeScript semantic errors shown in Errors window.

Errors collected on the background parser thread but only for the
currently open file.

Errors in Errors window are updated on every parse iteration so the
list flickers in the UI.

Currently the background parser does not handle references to other
TypeScript files so errors are shown for types defined in other
TypeScript files.

Add extra "Allow implicit 'any' type" check box to TypeScript Build in
project options.

Re-arranged UI for TypeScript project options. Ecma script version and
module selection is above the other compiler option check boxes.