try to make it more readable/understandable

SSLv2 support has been removed from OpenSSL in Ubuntu Oneiric

Remove some stuff we don't need:
    third_party libs
    Visual Studio / Xcode files
    symbian files

    pjmedia-audiodev (and update some source files accordingly)
    pjmedia-codec

    tests, documentation

define PJMEDIA_RESAMPLE_IMP PJMEDIA_RESAMPLE_NONE
    => so we don't rely on resample library

define PJMEDIA_HAS_SRTP     0
    => so we don't rely on srtp library

We do resampling and srtp ourselves anyway

Override by settings CXXFLAGS variable

refactor while we're at it

More pervasive changes were just to fix "transfert" typo

This is due to an issue with dmix where it will not release the device
after being closed.

remove unused functions

Update audio filters accordingly

remove unneeded class members
fix a bug with samplerate

use pa_stream_begin_write() when writing to speakers

simplify alsalayer xrun
split audio mainloop into smaller specific functions
simplify pulse audiostream
remove unused pulse functions