Support for Intel Integrated Performace Primitives (IPP) codecs

[bennylp]

The IPP codecs to be supported are based on IPP samples speech codec implementations, e.g: G.729, G.723.1, G.726, G.728, G.722.1, AMR.

[nanang]

In r2216: Initial source of IPP codecs wrapper.

[nanang]

In r2218:

• rearranged some codec properties, e.g: codec name, enable/disable, payload type
• fixed bug VAD setting on init USC codec

[nanang]

In r2219:

• Added codec AMR-WB
• Updated AMR & AMRWB to utilize quality flag in the AMR payload header
• Updated callback interface (frm_attr_cb() -> predecode_cb())

[nanang]

In r2223: Added missing IPP codec deinit and fixed matching #if-#endif in IPP codec encode.

[bennylp]

In r2225:

• a bit of tidying up and renamed few macro names.

[bennylp]

In r2231:

• fixed compilation warnings with gcc

[bennylp]

In r2232:

• autoconf support for Linux

[nanang]

In r2235: Fixed preprocessor check in pjsua_media.c on deinit-ing IPP codec.

[nanang]

In r2249: fixed bug on setting frametype in encode() related to special treatment for G729.

[bennylp]

Done, closing the ticket.