Smallchess face (#272)

* smallchess face

* use correct game-state modifying board move function

* make show last work after undo

* use SCL_Game->ply instead of board[ply_byte]

* beep when cpu is done computing a move

* increase engine strength to ply 3

* match ply type and use the local variable where available

* fix warnings

* add doc to smallchess face

* smallchess: fix compile warnings

* smallchess: move smallchesslib.h to movement/lib

movement/make/Makefile

@@ -24,6 +24,7 @@ INCLUDES += \
   -I../lib/vsop87/ \
   -I../lib/astrolib/ \
   -I../lib/morsecalc/ \
+  -I../lib/smallchesslib/ \
 
 # If you add any other source files you wish to compile, add them after ../app.c
 # Note that you will need to add a backslash at the end of any line you wish to continue, i.e.
@@ -147,6 +148,7 @@ SRCS += \
   ../watch_faces/demo/beeps_face.c \
   ../watch_faces/sensor/accel_interrupt_count_face.c \
   ../watch_faces/complication/metronome_face.c \
+  ../watch_faces/complication/smallchess_face.c \
 # New watch faces go above this line.
 
 # Leave this line at the bottom of the file; it has all the targets for making your project.