Moved contact provider internals to a private header.
I also added lots of methods to manipulate Contact Providers
Updated object macros from Belle Sip and stubbed 
LDAP implementation when LDAP support deactivated.
Always compile ldap so that stubbed versions are supported
Don't inlcude ldap.h when BUILD_LDAP is disabled
fix crash when receiving SDP with many mlines
add config.h inclusion
add opus to README.macos
change behavior of LinphoneCall::camera_enabled
It is now an application preference, the core never modifies it.
It represents whether the camera is allowed to be sent (in case of video request).
update README
Fix missing header in Makefile.am
Correct ldap support check.
Update mediastreamer 2
remove uri headers from Contact
fix unused variable
update README
Add missing symbol exports.
Update ms2 submodule for missing symbol exports.