Release 1.3.7 of TI Simplelink Connect

Release 1.3.7 of TI Simplelink Connect (#28)
This commit consolidates work done for Release 1.3.7 of the TI
Simplelink Connect iOS and Android application

Changes:
1. New unique screen for ECG (Electrocardiogram) service.
2. New unique screen for Accelerometer service.
3. New unique screen for Matter Lightening service.

Signed-off-by: Texas Instruments