added unittest for watching @types

[vladima]

changes in this PR

• added unit test for watching @types
• runtests-browser: use chrome as default browser in linux
• move checking project types version before the 'is program up-to-date' check. Reason: when new types are installed - it does not affect the list of root files so 'program-up-do-date' will yield true and we will not rebuild the program. Currently everything kind of work but for a different reason (set of root files usually does not include lib.d.ts and program pretty much always contains this file so up-do-date check fails because set of files did not match - ideally we should also fix it).

[mhegazy]

👍