settings: add support for default and local moderators

- add configurable list of default moderators
- add option for enabling local moderators
- indicate when participant is locally muted on moderation overlay
- small typo fixes

Change-Id: I1669c903be3c3a3f2344f1d95d8b618e62b9d412

jami-qt.pro

@@ -138,6 +138,7 @@ unix {
 # Input
 HEADERS += \
         src/avatarimageprovider.h \
+        src/moderatorlistmodel.h \
         src/networkmanager.h \
         src/smartlistmodel.h \
         src/updatemanager.h \
@@ -187,6 +188,7 @@ HEADERS += \
 SOURCES += \
         src/bannedlistmodel.cpp \
         src/accountlistmodel.cpp \
+        src/moderatorlistmodel.cpp \
         src/networkmanager.cpp \
         src/runguard.cpp \
         src/updatemanager.cpp \