adjustment ranges to adjustment slots when channel is within range.
example:
```
adjrange 0 0 0 900 1700 0 2
adjrange 1 0 0 1700 2100 1 2
```
explained:
* configure adjrange 0 to use adjustment slot 1 (0) so that when aux1
(0) in the range 900-1700 then do nothing when aux 3 (2) is in any
position.
* configure adjrange 1 to use adjustment slot 1 (0) so that when aux1
(0) in the range 1700-2100 then do use adjustment 1 (rc rate) when aux 3
(2) is in the appropriate position.
Without the entire range of aux1 being defined there is nothing that
would stop aux 3 adjusting the rc rate once aux 1 wasn't in the higher
range.
There are 4 adjustment slots and 12 adjustment ranges.
Adjustment slots and adjustment ranges can use the same aux channel.
e.g.
`adjrange 2 1 0 900 2100 1 3`
* configure adjrange 2 to use adjustment slot 2 (1) so that when aux4
(3) in the range 900-2100 then use adjustment 1 (rc rate) when aux 4 (3)
is in the appropriate position.
e.g. `adjrange 0 0 1700 2100 1 2`
set adjustment range 0, which applies to aux channel 0 (aux1) when range
is between 1700 and 2100 then apply function 1 (rc rate) to aux channel
2 (aux3)
- NVIC priorities are moved to separate file, all values are replaced wit symbolic names. Priorities should be the same.
- tiny change in DMA initialization
- use inline functions for gpio (typesafe, no speed penalty)
- fix sortSerialPortFunctions (original was IMO broken)
- allow softserial port on sonar pin when FEATURE_SONAR is not enabled
- minor style changes and comments
rcRate is decreased when low, increased when HIGH and no change when the
switch is in the middle.
The rcRate ticks up/down at 0.01 every 500ms if the switch is left on.
If using a momentary switch and if you can toggle the switch between
middle and low or middle and high more frequently than 500ms then the
rate will be increased accordingly. Similar to how a keyboard repeat
behaves.
Parallel PWM on STM32F10X targets. Fixes#80.
The check to see if usart2 should always be done. The PWM mapping code
decides on a per-target base if possible pwm input channels need to be
skipped due to pin usage clashes.
