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Detail:
The interrupt_semaphore is now atomically set, and is
atomically cleared before the interrupt routine thread runs.
This ensures that any subsequent SDIO Card Interupts will be
caught rather than potentially ignored if they occur while
the interrupt thread is running..

Global CCCR enable is set automatically when any other bits in the
CCCR are enabled, otherwise it is cleared. (within the sdmmc intr_enable
and intr_disable routines). This was already done in the sdio_io
equivalent routines.

Admin:

Detail:
Interrupt dispatch is handled by RTSupport threads, and can have
some latency. This ensures that if a second card interrupt occurs
before the interrupt routine is finished then the routine loops
around to respond.

Admin:

Detail:
It helps if the global enable bit in the CCCR_INT_ENABLE
is set. Now so done when a handler is registered.

Admin:

Version 0.03. Tagged as 'SDIOLib-0_03'

The code was attempting to use an invalid addressing mode for the STL
instruction.

Also fix a couple of CI job fails noticed in passing (should pass all jobs
when Support/CI_Source!13 is merged).

Version 0.02. Tagged as 'SDIOLib-0_02'