Usat Phase 2 feature and Screen status

This change combines below 3 fixes.
1) Usat Phase 2 fixes
Added changes to support Idle screen, Language Selection.

This also includes change to support Idle screen status information.

Fix to address alpha display for proactive commands

2) Telephony: Correct terminal response sent for Idle mode text cmd

When a proactive command : SET_UP_IDLE_MODE_TEXT arrives with
empty text and non-self explanatory icon, terminal response
:CMD_DATA_NOT_UNDERSTOOD should be sent back to the UICC as
per the SAT spec

3) The GCF Testcase GCF-PTCRB SAT/USAT 27.22.4.1.1seq1.2 expects a
screen busy response if the ME is not in idle screen and if the
display text message is a low priority message. Hence sending screen busy
response instead of RESPONSE_TIMEOUT. In present implementation a
USER_RESPONSE_TIMEOUT response is sent for all timeout cases.

Bug: 17553408
Change-Id: If7fb74a451d53a4475475ac570fa8ae9d1a08a3b