Organise Erlang source files into sub-folders

These sub-folders are only 1 level deep, as per the recommendations in the Erlang docs.

app/gui/qt/unix-prebuild.sh

@@ -28,7 +28,9 @@ ruby "${SCRIPT_DIR}/../../server/ruby/bin/compile-extensions.rb"
 
 echo "Compiling erlang files..."
 cd "${SCRIPT_DIR}/../../server/erlang"
-erlc src/*.erl -o ebin/
+erlc src/osc/*.erl -o ebin/
+erlc src/pi_server/*.erl -o ebin/
+erlc src/sp_midi/*.erl -o ebin/
 cp src/sonic_pi_server.app.src ebin/sonic_pi_server.app
 cd "${SCRIPT_DIR}"
 

app/gui/qt/win-prebuild.bat

@@ -31,6 +31,8 @@ forfiles /p lang /s /m *.ts /c "cmd /c %QT_INSTALL_LOCATION%\bin\lrelease.exe @f
 @echo Compiling Erlang BEAM files...
 cd %~dp0
 cd ..\..\server\erlang
-forfiles /m src\*.erl /c "cmd /c ..\native\erlang\bin\erl.exe -compile @fname -o ebin\"
+forfiles /m src\osc\*.erl /c "cmd /c ..\native\erlang\bin\erl.exe -compile @fname -o ebin\"
+forfiles /m src\pi_server\*.erl /c "cmd /c ..\native\erlang\bin\erl.exe -compile @fname -o ebin\"
+forfiles /m src\sp_midi\*.erl /c "cmd /c ..\native\erlang\bin\erl.exe -compile @fname -o ebin\"
 xcopy /Y /I /R /E src\sonic_pi_server.app.src ebin\sonic_pi_server.app
 cd %~dp0

app/server/erlang/sonic_pi_server/src/sp_midi.erl → app/server/erlang/sonic_pi_server/src/sp_midi/sp_midi.erl

@@ -3,11 +3,11 @@
         set_this_pid/1, set_log_level/1, schedule_callback/3, get_current_time_microseconds/0]).
 -on_load(init/0).
 
--define(APPNAME, sonic_pi_server).
+-define(APPLICATION, sonic_pi_server).
 -define(LIBNAME, "libsp_midi").
 
 init() ->
-    SoName = case code:priv_dir(?APPNAME) of
+    SoName = case code:priv_dir(?APPLICATION) of
         {error, bad_name} ->
             case filelib:is_dir(filename:join(["..", priv])) of
                 true ->