Check maximum number of addons per device, during config loading

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@5156 43c1dc8c-776e-4df2-8ef1-6e829299be21
Revert to using SCCP_DEVICE_RESTART(0x2), not all devices seem to like SCCP_DEVICE_RELOAD_CONFIG (0x3)

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@5157 43c1dc8c-776e-4df2-8ef1-6e829299be21
Countdown the number of endcall buttonpresses on a sharedline, so that the last one, can actually end the call, and the caller will be hungup, to notify everybody declined the call (RB: 53)

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@5158 43c1dc8c-776e-4df2-8ef1-6e829299be21