Fix broken addListener() & delListener() handling.

[varumugam123]

Now every time client makes a call to delListener(), rtFunctionRef() gets new ID and server doesn't identify it when it matches it with the stored handlers.

This change will ensure at client rtFuncionRef stores the id after creation and refers that hence forth instead of creating new one everytime. And at the server side, the received
id (i.e. 'func://') is used to calculate a hash which is then used for add / del listeners

[varumugam123]

Sample Server & Client to verify this:

rtSampleClient.txt
rtSampleServer.txt

[varumugam123]

Output of the attached sample server is :

madan@madan-VirtualBox:~/pxscene/pxCore/remote$
 ./rtSampleServer
rt: WARN rtSampleServer.cpp:29 -- Thread-25823: 0xf098a0 (func://9edc2334-45c2-4c28-bd64-c6d46c1ae3fb) is added for "onTestEvent" event
rt: WARN rtSampleServer.cpp:29 -- Thread-25823: 0xf09a00 (func://db67db85-3ef3-4a87-b1ca-a209412aca9c) is added for "onTestEvent" event
rt: WARN rtSampleServer.cpp:29 -- Thread-25823: 0xf09960 (func://e168cfcf-4919-408c-853e-5085c8c537e7) is added for "onTestEvent" event
rt: WARN rtSampleServer.cpp:29 -- Thread-25823: 0xf09ad0 (func://a5b06bf1-a8b6-4215-92a3-ebcdcae8447e) is added for "onTestEvent" event
rt: WARN rtSampleServer.cpp:29 -- Thread-25823: 0xf09d60 (func://b54909db-5acc-4a0b-ac70-48e4760d665c) is added for "onTestEvent" event
rt: WARN rtSampleServer.cpp:42 -- Thread-25823: 0xefac30 is not removed from "onTestEvent" event
rt: WARN rtSampleServer.cpp:40 -- Thread-25823: 0xefac30 (func://9edc2334-45c2-4c28-bd64-c6d46c1ae3fb) is removed from "onTestEvent" event
rt: WARN rtSampleServer.cpp:40 -- Thread-25823: 0xefac00 (func://db67db85-3ef3-4a87-b1ca-a209412aca9c) is removed from "onTestEvent" event
rt: WARN rtSampleServer.cpp:40 -- Thread-25823: 0xf09a00 (func://e168cfcf-4919-408c-853e-5085c8c537e7) is removed from "onTestEvent" event
rt: WARN rtSampleServer.cpp:40 -- Thread-25823: 0xefab70 (func://a5b06bf1-a8b6-4215-92a3-ebcdcae8447e) is removed from "onTestEvent" event
rt: WARN rtSampleServer.cpp:40 -- Thread-25823: 0xefab70 (func://b54909db-5acc-4a0b-ac70-48e4760d665c) is removed from "onTestEvent" event

Thanks @madanagopalt for helping with testing this change on latest code.

[varumugam123]

#1111 seems to be breaking the "addListener()" functionality on native rtRemote component. The above PR initializes m_Hash of all the rtRemoteFunction objects to 0, which causes addListener() to skip adding the handlers to the list.

The proposed solution initializes m_Hash with the hash of its name (a unique id "func://xyz"), this way ensures both addListener() & delListener() works fine.

[dwrobel]

Shouldn't that also address/fix #1113 (original regression caused by #1041 and duplicate listeners behaviour)?