wsjtx: try to clean up the setting of struct qso members

The error checking also added to the bloat.  This commit hides the error
check in a macro.

Signed-off-by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>

wsjtx: base logged contacts on the contest template

This is the same thing as what the UI does.  In general, the value from the
template is used but wsjtx packet values override whatever may be in the
template.

It is therefore important for wsjxt to *not* include values that are not
meant to override the template.  For example, wsjtx should *not* provide an
operator callsign as that will override the callsign from the template.

Signed-off-by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>

hlog: move startup-stats iteration into lua

It's silly to have the loop in C when we can write it in lua - yielding
fewer lines of code, more readable code, etc.

Signed-off-by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>

contest: pass wsjtx contacts to qso-done script event handler

Signed-off-by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>

contest: split wsjtx listener from other listeners

Even though the wsjtx code listens for network packets, it isn't just
another listener - it's the second method for contact entry.  Therefore,
let's move the wsjtx_start call right next to the UI start code where it
makes better sense.

Signed-off-by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>

contest: separate out generic contest logic from ui code

In a way, this demotes the UI from the central point of the contest binary
to being just one of potentially many ways to input entries into the system.

Signed-off-by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>

xlua: add locking support to struct xlua_state

Signed-off-by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>

xlua: wrap lua_State pointer in struct xlua_state

This will allow us to associate additional fiels with the lua state.
Since the wrapper structure (struct xlua_state) is a different type than
lua_State, the compiler will catch any usage errors - i.e., passing
xlua_state to a function that expects a lua_State and vice versa.

This wrapper nicely delineates C functions that are called by C code and C
functions called (possibly indirectly) by lua.

Signed-off-by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>

Add a LICENSE file

Signed-off-by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>

contest: add a window with summary of other instances on the network

This window has some limitations.  For example, it is fixed size so only the
first 5 instances will ever be displayed, instances that disappear forever
will take up one of the 5 lines, etc.

Signed-off-by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>

contest: print a message for each QSO announcement

Signed-off-by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>

rpc: add 'all announcements' callback function

This will be useful for the network status window and similar usecases.

Signed-off-by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>

rpc: dedup qso announcements

We may receive more than one copy of the same announcement because we may
share the same multiple subnets as the sending instance, or we may have more
than one IP on a subnet.  Either way, we don't want to spam the callbacks
with duplicate QSO announcements.  So, we keep a small circular buffer of
last NUM_QSO_DEDUP uuids that we received for each instance.

Signed-off-by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>