FreeEMS 0.0.9 Exponent

Changes:

Refined injector control further
Implemented RTC in RTI for 1/8 milli, milli, tenths of, seconds, minutes each with 65535 max
Removed 6x duplication in injection_isrs.c by splitting to injector_isr.c and using defines and imports.
Added support for individual fuel pulse widths
Added latency adjustments and recording to minimum pulse width
Added code run time recording for each channel
Updated docs for injection algorithm
Added LVI interrupt logging to record low voltage conditions.
Added ADC sampling and flagging code
Heavily revised all fuel code to use arrays instead of defines.
Removed 6x duplication in the scheduler code
Tidied up MANY comments and code blocks a LOT