Added ToDo & ideas and placed in source second file - to keep main co…

…de uncluttered

FreeIMU_inertial_mouse_leonardo_Teensy/ToDo_and_Ideas.ino

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+/* TODO stuff:-
+
+refactor - get ready for 
+    multiple sensor data types/averaging/..., 
+    dif data sets (head mount), 
+    more data processing (more steps, non-linear etc)
+    auto en/disable
+    .....
+
+>>>>Check what freeIMU lib does if IMU buffer over-runs!!!!!!
+.. eg if add delays to main loop to control mouse update rate!
+or if serial console debug printing slows things down...
+
+?/ any sign of freezing (uses SPI - NO not with MMU 6050 - only I2C)????
+    WAS 100% reliable for many many minutes :)
+    dam - TWO lockups after ~ 1+hours
+    cf past notes/ideas on trying to fix/bypass
+        + auto try close/reset of sensor, then of Arduino
+        ?? watchdog process - for sensor data, for arduino
+   research freeIMU - lockup/hanging.....
+   switch to MMU 6000(?) & use SPI?????
+   ... it is waay better that Arduino I2C
+
+More buttons OR 3/4 clicks to
+ - reset cursor to center or highlihgt/flash
+ - en/disable
+ 
+*** test head mouse - may need try dif axis - y!!!
+
+	*** MAIN GOAL ATM = easy use - eg easy click button, type onscreen kb, **radio/check boxes**
+	- try offset to cfg sensor & body alignement
+	- TEST on wrist, arm, head
+	2nd goal - MOUSE MODES - tilt(gyro), trad mouse move but in air = linear movement (accel TRY REDUCED G RANGE &/OR ADD MOVING AV), QUATERNIONS (W,X,Y,Z) =SO JUST TRY X,Y OR Z,Y PARTS ONLY!!!!!
+	- some videos of device on finger, wrist, arm, head AND screen captures
+
+	OTHER goals - gesture/tap/orientation OR accel to act as switches/cmds
+	OHTER goals - use as kb to send keys eg open browser, email, gazetalk etc, OR adj muse cfg....
+	MOUSE UPDATE RATE - review recent notes, check current code/Teensy RATE, check MMU sensor cfg rate (in cfg AND via log to memory, then dump to serial when mouse OFF. LOOKING TO SEE IF DATA REAL TIME, OR LAGGING/BUNCHED UP DUE TO BUFFERING **AND** IF RATE TOO SLOW/FAST
+
+IGNORE FOR NOW!!!!!
+	- try mouse on = auto center cursor - just testing if OK - add sep switch/action to trigger 
+		  - CAN'T DO from Arduino Mouse cmd - only relative
+		  - o/s mouse cfg, eg press ctl to highlight mouse, or some other o/s API.......
+
+
+
+   seem like EASY & ready to hand way en/disable is IMPORTANT
+   .... can't hold your finger/hand/etc still for long times!
+   button is OK - just need right size & physical layout
+   maybe add timer on movement to auto en/disable
+   ??? instead of mouse + en/disable buttons
+   an alternate way might be small thumb joystick - equiv 5 buttons
+   does need to be very small to fit in between thumb & forefinger
+*/
+