input: added INPUT_ADD_SLAVE to allow adding a slave input on the fly. (Don't use without a real reason).

* src/misc/vlm.c: partial revert of commit 9353. Do not use strncmp() when it isn't needed. It just makes the code less readable and more prone to bugs.

* fix bug in SDP parser

wx: really commit last commit

    - coding style fixes
    - adapted to new playlist API
    - only put generic things in Meta-information

wxWidgets:
    - Fixed playlist updating

core:
    - added playlist_ItemGetByInput
    - implemented input_item_t.b_fixed name : if this is set, the interface should not try to "improve" the display string.

* implemented delete, but for some reason the key events don't arrive

* Fix locking issues in services discovery
* Add playlist_Replace function
* Beginning of playlist_TreeMove
* Fix some warnings
* Doxygen update

  - basic data retrieval implemented
  - data display not yet implemented
  - many broken outlets and even more broken actions
  - won't compile
  - if you work on this (and please do) please communicate this fact to the IRC channel and make regurlar commits to prevent that multiple people work on this (and especially the NIB).

Coding style fixes (much more left)

  fix the playlist autodelete