1. Move JAMI_DATA_HOME, JAMI_CONFIG_HOME, JAMI_CACHE_HOME
   setup into individual test main entry
2. Use google test assertion macros instead of Qt
3. Add QT_QPA_FONTDIR to avoid QFont warnings
4. Tests will now fail if the env variables cannot be set

Change-Id: I63f6498d26b646d8ebc60799d8797fd5f13b54f9

Using a custom getter setter cause the setting of the value to
require manual changed signal emission and in addition to being
error prone, this prevents the changed signal from being emitted
upon initial selection. Some excess workaround code may be removed
in following commits.

This patch also refactors the banned contact signaling as part of
an accountadapter connection cleanup.

Change-Id: I73fb751001e53e086adc7a6a8d706671c2878a77

1. Add building tests only option in the build script
2. Google test intergration enhancement
3. Properly use QSignalSpy wait function

Change-Id: I5ec1b33e191cebd8a14c19d92ee4eb4d40f054c3

Add global test environment for google test

Change-Id: Id035ebf31498e11574b6bf4671b4c6e12d29ddc7