Implement Transfersubscription service

[mregen]

• Implement client and server side of Transfersubscription service calls.
• New Transcription service has been tested with CTT 1.04.9.398
• Unit tests for native service calls and client SDK
• Client implements multiple ways to transfer sessions:
  • Client saves subscriptions to xml stream, restarts, loads subscriptions from stream and transfers on server.
  • Client creates a new sessions and transfers into new session, while the old session is still active.
  • Client closes old session with DeleteSubscriptionsOnClose = false, creates new session and transfers subscriptions to new session.
  • SessionReconnectHandler tries to transfer subscription before recreating the subscriptions.

[lgtm-com]

This pull request introduces 3 alerts and fixes 1 when merging 2b6fc0d into 33ae736 - view on LGTM.com

new alerts:

• 2 for Useless assignment to local variable
• 1 for Use of default ToString()

fixed alerts:

• 1 for Dereferenced variable may be null

[lgtm-com]

This pull request introduces 3 alerts and fixes 1 when merging 1c2d1d7 into 8d3e393 - view on LGTM.com

new alerts:

• 2 for Useless assignment to local variable
• 1 for Use of default ToString()

fixed alerts:

• 1 for Dereferenced variable may be null

[lgtm-com]

This pull request introduces 3 alerts and fixes 1 when merging b952888 into 8d3e393 - view on LGTM.com

new alerts:

• 2 for Useless assignment to local variable
• 1 for Use of default ToString()

fixed alerts:

• 1 for Dereferenced variable may be null

[lgtm-com]

This pull request introduces 2 alerts and fixes 1 when merging bd5acbc into 8d3e393 - view on LGTM.com

new alerts:

• 1 for Use of default ToString()
• 1 for Useless assignment to local variable

fixed alerts:

• 1 for Dereferenced variable may be null

[lgtm-com]

This pull request introduces 2 alerts and fixes 1 when merging 6a5340c into 8d3e393 - view on LGTM.com

new alerts:

• 1 for Use of default ToString()
• 1 for Useless assignment to local variable

fixed alerts:

• 1 for Dereferenced variable may be null

[lgtm-com]

This pull request introduces 2 alerts and fixes 1 when merging d5d82cf into 8d3e393 - view on LGTM.com

new alerts:

• 1 for Use of default ToString()
• 1 for Useless assignment to local variable

fixed alerts:

• 1 for Dereferenced variable may be null

[lgtm-com]

This pull request introduces 2 alerts and fixes 1 when merging bd66601 into 8d3e393 - view on LGTM.com

new alerts:

• 1 for Use of default ToString()
• 1 for Useless assignment to local variable

fixed alerts:

• 1 for Dereferenced variable may be null

[lgtm-com]

This pull request introduces 2 alerts and fixes 1 when merging b75d714 into 8d3e393 - view on LGTM.com

new alerts:

• 1 for Use of default ToString()
• 1 for Useless assignment to local variable

fixed alerts:

• 1 for Dereferenced variable may be null

[lgtm-com]

This pull request introduces 2 alerts and fixes 1 when merging 3cc7b30 into 8d3e393 - view on LGTM.com

new alerts:

• 1 for Use of default ToString()
• 1 for Useless assignment to local variable

fixed alerts:

• 1 for Dereferenced variable may be null

[lgtm-com]

This pull request introduces 2 alerts and fixes 1 when merging 1998f48 into 079148f - view on LGTM.com

new alerts:

• 1 for Use of default ToString()
• 1 for Useless assignment to local variable

fixed alerts:

• 1 for Dereferenced variable may be null