temperature_sensors: Deprecate "NTC 100K beta 3950" thermistor

It seems the common "beta 3950" thermistors generally follow a
temperature table defined by the new "Generic 3950" definition.  Using
a table that actually follows the "beta 3950" temperature curve is
generally less accurate.  Deprecate the existing "NTC 100K beta 3950"
definition to avoid this common issue.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

config/generic-bigtreetech-skr-2.cfg

@@ -73,7 +73,7 @@ max_temp: 250
 
 [heater_bed]
 heater_pin: PD7
-sensor_type: NTC 100K beta 3950
+sensor_type: Generic 3950
 sensor_pin: PA1
 control: watermark
 min_temp: 0

config/generic-duet3-mini.cfg

@@ -123,7 +123,7 @@ sense_resistor: 0.056
 
 [heater_bed]
 heater_pin: PB17 #out1
-sensor_type: NTC 100K beta 3950
+sensor_type: Generic 3950
 sensor_pin: vref_scaled:PC0
 control: pid
 pullup_resistor: 2200

config/generic-mks-rumba32-v1.0.cfg

@@ -72,7 +72,7 @@ max_temp: 250
 
 [heater_bed]
 heater_pin: PA1
-sensor_type: NTC 100K beta 3950
+sensor_type: Generic 3950
 sensor_pin: PC0
 control: watermark
 min_temp: 0

config/generic-rumba.cfg

@@ -74,7 +74,7 @@ max_temp: 250
 
 [heater_bed]
 heater_pin: PH6
-sensor_type: NTC 100K beta 3950
+sensor_type: Generic 3950
 sensor_pin: PK3
 control: watermark
 min_temp: 0

config/kit-voron2-250mm.cfg

@@ -141,7 +141,7 @@ max_extrude_only_distance: 780.0
 heater_pin: PB4
 #   D10 on mcu_xye
 max_power: 1.0
-sensor_type: NTC 100K beta 3950
+sensor_type: Generic 3950
 sensor_pin: PK5
 #   T0 on mcu_xye
 smooth_time: 3.0

config/printer-mtw-create-2015.cfg

@@ -79,7 +79,7 @@ max_temp: 275
 
 [heater_bed]
 heater_pin: PE5
-sensor_type: NTC 100K beta 3950
+sensor_type: Generic 3950
 sensor_pin: PF2
 control: watermark
 min_temp: 0

config/printer-wanhao-duplicator-i3-v2.1-2017.cfg

@@ -127,7 +127,7 @@ rotation_distance: 29.888
 nozzle_diameter: 0.400
 filament_diameter: 1.750
 heater_pin: PD5
-sensor_type: NTC 100K beta 3950
+sensor_type: Generic 3950
 sensor_pin: PA7
 control: pid
 pid_Kp: 18.214030
@@ -138,7 +138,7 @@ max_temp: 230
 
 [heater_bed]
 heater_pin: PD4
-sensor_type: NTC 100K beta 3950
+sensor_type: Generic 3950
 sensor_pin: PA6
 control: pid
 pid_Kp: 71.321