BMW updates (commaai#572)

* Initial test commit

Throttle and steering wheel sensors for K-CAN

* Update BMW E-series

* Rename BMW E-series to BMW E-series K+CAN

* OpenDBC updates

* Added brake pedal pressed

* Cruise control commands

* Delete BMW E-series K+CAN

Replaced with dbc file generated by cabana

* Update BMW E-series K+CAN.dbc

Fixed names

* brake depress flag

* Fixes after cabana broke it

* Fixed names. 

Fixed names. Removed space

* Removed module names due to bug/conflict?

One module name left XXX

* Fixed many DBC syntax issues

Removed illegal characters
Removed spaces

* SteeringButtons

* Rename BMW E-series K+CAN.dbc to BMW E-series CAN.dbc

* Cruise counters set to Big endian

* Added bunch of unknown messages

* cruiseControlStatus

* cruise speed scaling

* Added some cruise statuses

* Corrected to throttle

* Updated pedal statuses

* Cruise control

Added cruise control signals

* Dynamic cruise control vehicle option has different can messages

* Added can messages from SZL

* Removed spaces

* Other can messages

* OpenDBC updates

* OpenDBC updates

* OpenDBC updates

* Steering wheel sensor DSC

* BMW dbc copied from OpenDBC repository https://github.com/dzid26/opendbc-BMW-E8x-E9x/

* Steering Wheel angle and wheels speed

* acc pedal

* size set to 7

* OpenDBC updates

* OpenDBC updates

* OpenDBC updates

* OpenDBC updates

* OpenDBC updates

* OpenDBC updates

* OpenDBC updates

* Delete BMW E-series CAN dev.dbc

* OpenDBC updates

* OpenDBC updates

* Corrected cruise control pedal pressed vs driver pedal pressed

* OpenDBC updates

* Speed scaling

* unit

* Added F-CAN missing signals - unknown

* Added unknown messages

* OpenDBC updates

* another wheel position - active all the time

* OpenDBC updates

* OpenDBC updates

* Added units; fixed steering speed signal in 0xc4

* OpenDBC updates

* OpenDBC updates

* message size

* Added motor controller CAN message

* Added kph factor to WheelSpeeds from DSC

* Added (invented) OpenPilot request message

* Improved OpenActuator packing

* Removed openSteering messages.
Added gear enums and cruise +5/-5
Renames...

* wiper button

* Added blinkers

* Added lateral and longitudal accelerometers and battery voltage

* Added engine torque

* Added dynamic cruise control torque request signal

* Added ignition terminal states

* OpenDBC updates

* Added GearSelector postion signals inspired by https://www.spoolstreet.com/threads/gs7-program-code-disassembly-project.6045/post-93145

* Added PRND states. Confirmed with https://bmw.spoolstreet.com/threads/gs7-program-code-disassembly-project.6045/post-94403

* Updated ShiftLeverPosition to bit-wise for readability. Added enumeration.

* Added some counter signals

* OpenDBC updates

* Added BMW CANbus overview.

* correction

* Update README.md

* Added Ignition ON, modified steering ratio factor

* Added accelerators and checksum signals in Speed message

* Another acceleration and gyro

* More precise steering factor

* Speed message cleanup

* Added traction control off button message

* Added sender nodes and improved message names

* Added messages from other BMW models

* Added few target nodes

* Added torque factors

* Added DSC statuses

* Tentatively added MDM status signal

* Counters are not cheksums. Checksums and counters revised. SteeringWheelAngle_DSC name reverted!

* Endianness consistency.