We should be able to initialize install of JRE/FX in background assuming that:
a) install method need to ask user acknoledgement
b) install method takes js callback handler to be called once install is complete (successfully or on error)
(ideally one more onProgress handler)
c) closing browser while install is running should not abort install. Callback can be skipped then
Initial implementation is done.
A thread is created for JRE and FX installations.
The fix also got rid of the usage of "USES_CONVERSION"; _bstr_t was used instead.
Subsequent CRs (7073627 & 7073628) have been filed to address remaining issues.