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
CRs-Fixed: 432647
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
CRs-Fixed: 280223

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.

Change-Id: I8370dfab498ce632a04d1b24ad576c30dbd8ccfd
(cherry picked from commit 3e818d3bcaec969a1ebf11221fbb8c34c942baaa)
(cherry picked from commit fb24c77ab64d1792caefdc8fa56bf24a824c17d2)
(cherry picked from commit d3feb56b34a6f84dddcae59058bd286e37723f00)